31994816 has 56 divisors (see below), whose sum is σ = 76846176. Its totient is φ = 12902400.

The previous prime is 31994813. The next prime is 31994839. The reversal of 31994816 is 61849913.

It is a tau number, because it is divible by the number of its divisors (56).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31994813) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5516 + ... + 9716.

Almost surely, 2^31994816 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 31994816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38423088).

31994816 is an abundant number, since it is smaller than the sum of its proper divisors (44851360).

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

31994816 is a wasteful number, since it uses less digits than its factorization.

31994816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4237 (or 4227 counting only the distinct ones).

The product of its digits is 46656, while the sum is 41.

The square root of 31994816 is about 5656.3960257394. The cubic root of 31994816 is about 317.4630655364.

The spelling of 31994816 in words is "thirty-one million, nine hundred ninety-four thousand, eight hundred sixteen".