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1968389 = 10119489
BaseRepresentation
bin111100000100100000101
310201000010022
413200210011
51000442024
6110104525
722505513
oct7404405
93630108
101968389
111124975
127ab145
1353bc37
143934b3
1528d35e
hex1e0905

1968389 has 4 divisors (see below), whose sum is σ = 1987980. Its totient is φ = 1948800.

The previous prime is 1968383. The next prime is 1968391. The reversal of 1968389 is 9838691.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 917764 + 1050625 = 958^2 + 1025^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-1968389 is a prime.

It is a super-3 number, since 3×19683893 = 22879895833398143607, which contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1968383) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9644 + ... + 9845.

It is an arithmetic number, because the mean of its divisors is an integer number (496995).

21968389 is an apocalyptic number.

It is an amenable number.

1968389 is a deficient number, since it is larger than the sum of its proper divisors (19591).

1968389 is a wasteful number, since it uses less digits than its factorization.

1968389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19590.

The product of its digits is 93312, while the sum is 44.

The square root of 1968389 is about 1402.9928723981. The cubic root of 1968389 is about 125.3247873744.

The spelling of 1968389 in words is "one million, nine hundred sixty-eight thousand, three hundred eighty-nine".

Divisors: 1 101 19489 1968389