31397696 has 56 divisors (see below), whose sum is σ = 68787264. Its totient is φ = 14100480.

The previous prime is 31397689. The next prime is 31397701. The reversal of 31397696 is 69679313.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 72296 + ... + 72728.

It is an arithmetic number, because the mean of its divisors is an integer number (1228344).

Almost surely, 2^31397696 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31397696, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34393632).

31397696 is an abundant number, since it is smaller than the sum of its proper divisors (37389568).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31397696 is a wasteful number, since it uses less digits than its factorization.

31397696 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 559 (or 549 counting only the distinct ones).

The product of its digits is 183708, while the sum is 44.

The square root of 31397696 is about 5603.3647034617. The cubic root of 31397696 is about 315.4757102163.

The spelling of 31397696 in words is "thirty-one million, three hundred ninety-seven thousand, six hundred ninety-six".