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1228697 = 7091733
BaseRepresentation
bin100101011111110011001
32022102110022
410223332121
5303304242
642200225
713305131
oct4537631
92272408
101228697
1176a158
124b3075
13340352
1423dac1
151940d2
hex12bf99

1228697 has 4 divisors (see below), whose sum is σ = 1231140. Its totient is φ = 1226256.

The previous prime is 1228693. The next prime is 1228741. The reversal of 1228697 is 7968221.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7968221 = 15750753.

It can be written as a sum of positive squares in 2 ways, for example, as 337561 + 891136 = 581^2 + 944^2 .

It is a cyclic number.

It is not a de Polignac number, because 1228697 - 22 = 1228693 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1228691) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 158 + ... + 1575.

It is an arithmetic number, because the mean of its divisors is an integer number (307785).

21228697 is an apocalyptic number.

1228697 is the 593-rd centered heptagonal number.

It is an amenable number.

1228697 is a deficient number, since it is larger than the sum of its proper divisors (2443).

1228697 is an equidigital number, since it uses as much as digits as its factorization.

1228697 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2442.

The product of its digits is 12096, while the sum is 35.

The square root of 1228697 is about 1108.4660572160. The cubic root of 1228697 is about 107.1062792388.

The spelling of 1228697 in words is "one million, two hundred twenty-eight thousand, six hundred ninety-seven".

Divisors: 1 709 1733 1228697