31395996 has 72 divisors (see below), whose sum is σ = 82555200. Its totient is φ = 10053120.

The previous prime is 31395983. The next prime is 31396003. The reversal of 31395996 is 69959313.

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 23 ways as a sum of consecutive naturals, for example, 131245 + ... + 131483.

It is an arithmetic number, because the mean of its divisors is an integer number (1146600).

Almost surely, 2^31395996 is an apocalyptic number.

31395996 is a gapful number since it is divisible by the number (36) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31395996, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41277600).

31395996 is an abundant number, since it is smaller than the sum of its proper divisors (51159204).

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

31395996 is a wasteful number, since it uses less digits than its factorization.

31395996 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 379 (or 374 counting only the distinct ones).

The product of its digits is 196830, while the sum is 45.

The square root of 31395996 is about 5603.2130068381. The cubic root of 31395996 is about 315.4700163974.

The spelling of 31395996 in words is "thirty-one million, three hundred ninety-five thousand, nine hundred ninety-six".