31990976 has 56 divisors (see below), whose sum is σ = 67202304. Its totient is φ = 15079680.

The previous prime is 31990969. The next prime is 31990979. The reversal of 31990976 is 67909913.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (31990979) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 151511 + ... + 151721.

Almost surely, 2^31990976 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 31990976, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33601152).

31990976 is an abundant number, since it is smaller than the sum of its proper divisors (35211328).

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

31990976 is a wasteful number, since it uses less digits than its factorization.

31990976 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 349 (or 339 counting only the distinct ones).

The product of its (nonzero) digits is 91854, while the sum is 44.

The square root of 31990976 is about 5656.0565768033. The cubic root of 31990976 is about 317.4503644482.

The spelling of 31990976 in words is "thirty-one million, nine hundred ninety thousand, nine hundred seventy-six".