15697381 has 16 divisors (see below), whose sum is σ = 18921600. Its totient is φ = 12737088.

The previous prime is 15697373. The next prime is 15697391. The reversal of 15697381 is 18379651.

It is not a de Polignac number, because 15697381 - 2³ = 15697373 is a prime.

It is a super-2 number, since 2×15697381² = 492815540518322, which contains 22 as substring.

It is a Duffinian number.

It is a plaindrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15697391) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10030 + ... + 11488.

It is an arithmetic number, because the mean of its divisors is an integer number (1182600).

Almost surely, 2^15697381 is an apocalyptic number.

It is an amenable number.

15697381 is a deficient number, since it is larger than the sum of its proper divisors (3224219).

15697381 is a wasteful number, since it uses less digits than its factorization.

15697381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1548.

The product of its digits is 45360, while the sum is 40.

The square root of 15697381 is about 3961.9920494620. The cubic root of 15697381 is about 250.3854374465.

The spelling of 15697381 in words is "fifteen million, six hundred ninety-seven thousand, three hundred eighty-one".