31908380 has 48 divisors (see below), whose sum is σ = 77898240. Its totient is φ = 10751808.

The previous prime is 31908379. The next prime is 31908397. The reversal of 31908380 is 8380913.

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 15 ways as a sum of consecutive naturals, for example, 6329 + ... + 10191.

It is an arithmetic number, because the mean of its divisors is an integer number (1622880).

Almost surely, 2^31908380 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 31908380, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38949120).

31908380 is an abundant number, since it is smaller than the sum of its proper divisors (45989860).

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

31908380 is a wasteful number, since it uses less digits than its factorization.

31908380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3938 (or 3936 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 32.

The square root of 31908380 is about 5648.7503042708. The cubic root of 31908380 is about 317.1769255860.

The spelling of 31908380 in words is "thirty-one million, nine hundred eight thousand, three hundred eighty".