31839980 has 48 divisors (see below), whose sum is σ = 72739296. Its totient is φ = 11658240.

The previous prime is 31839979. The next prime is 31839989. The reversal of 31839980 is 8993813.

It is not an unprimeable number, because it can be changed into a prime (31839989) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11315 + ... + 13845.

It is an arithmetic number, because the mean of its divisors is an integer number (1515402).

Almost surely, 2^31839980 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 31839980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36369648).

31839980 is an abundant number, since it is smaller than the sum of its proper divisors (40899316).

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

31839980 is a wasteful number, since it uses less digits than its factorization.

31839980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2594 (or 2592 counting only the distinct ones).

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

The square root of 31839980 is about 5642.6926196631. The cubic root of 31839980 is about 316.9501259992.

The spelling of 31839980 in words is "thirty-one million, eight hundred thirty-nine thousand, nine hundred eighty".