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1686893 = 13172449
BaseRepresentation
bin110011011110101101101
310011200222112
412123311231
5412440033
6100053405
720224025
oct6336555
93150875
101686893
11a5242a
12694265
13470a80
1431ca85
15234c48
hex19bd6d

1686893 has 12 divisors (see below), whose sum is σ = 1934100. Its totient is φ = 1462272.

The previous prime is 1686871. The next prime is 1686907. The reversal of 1686893 is 3986861.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 40804 + 1646089 = 202^2 + 1283^2 .

It is not a de Polignac number, because 1686893 - 28 = 1686637 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1686893.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1686823) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3533 + ... + 3981.

It is an arithmetic number, because the mean of its divisors is an integer number (161175).

21686893 is an apocalyptic number.

1686893 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

1686893 is a deficient number, since it is larger than the sum of its proper divisors (247207).

1686893 is a wasteful number, since it uses less digits than its factorization.

With its successor (1686894) it forms a Ruth-Aaron pair, since the sum of their prime factors is the same (496).

1686893 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 496 (or 479 counting only the distinct ones).

The product of its digits is 62208, while the sum is 41.

The square root of 1686893 is about 1298.8044502542. The cubic root of 1686893 is about 119.0408023348.

Subtracting 1686893 from its reverse (3986861), we obtain a cube (2299968 = 1323).

It can be divided in two parts, 16868 and 93, that added together give a palindrome (16961).

The spelling of 1686893 in words is "one million, six hundred eighty-six thousand, eight hundred ninety-three".

Divisors: 1 13 17 221 289 449 3757 5837 7633 99229 129761 1686893