31939380 has 192 divisors, whose sum is σ = 114508800. Its totient is φ = 7309440.

The previous prime is 31939351. The next prime is 31939381. The reversal of 31939380 is 8393913.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31939381) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 112719 + ... + 113001.

It is an arithmetic number, because the mean of its divisors is an integer number (596400).

Almost surely, 2^31939380 is an apocalyptic number.

31939380 is a gapful number since it is divisible by the number (30) 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 31939380, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (57254400).

31939380 is an abundant number, since it is smaller than the sum of its proper divisors (82569420).

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

31939380 is a wasteful number, since it uses less digits than its factorization.

31939380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 331 (or 323 counting only the distinct ones).

The product of its (nonzero) digits is 17496, while the sum is 36.

The square root of 31939380 is about 5651.4936078881. The cubic root of 31939380 is about 317.2796081438.

The spelling of 31939380 in words is "thirty-one million, nine hundred thirty-nine thousand, three hundred eighty".