31696389 has 12 divisors (see below), whose sum is σ = 48193600. Its totient is φ = 20018664.

The previous prime is 31696363. The next prime is 31696439. The reversal of 31696389 is 98369613.

31696389 is a `hidden beast` number, since 3 + 1 + 6 + 9 + 638 + 9 = 666.

It is not a de Polignac number, because 31696389 - 2⁷ = 31696261 is a prime.

It is a super-2 number, since 2×31696389² = 2009322151278642, which contains 22 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 (31696319) 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, 92509 + ... + 92850.

Almost surely, 2^31696389 is an apocalyptic number.

It is an amenable number.

31696389 is a deficient number, since it is larger than the sum of its proper divisors (16497211).

31696389 is a wasteful number, since it uses less digits than its factorization.

31696389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 185384 (or 185381 counting only the distinct ones).

The product of its digits is 209952, while the sum is 45.

The square root of 31696389 is about 5629.9546179343. The cubic root of 31696389 is about 316.4729505270.

The spelling of 31696389 in words is "thirty-one million, six hundred ninety-six thousand, three hundred eighty-nine".