31297380 has 48 divisors (see below), whose sum is σ = 90659520. Its totient is φ = 8057728.

The previous prime is 31297373. The next prime is 31297397. The reversal of 31297380 is 8379213.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7254 + ... + 10733.

It is an arithmetic number, because the mean of its divisors is an integer number (1888740).

Almost surely, 2^31297380 is an apocalyptic number.

31297380 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

31297380 is an abundant number, since it is smaller than the sum of its proper divisors (59362140).

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

31297380 is a wasteful number, since it uses less digits than its factorization.

31297380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18028 (or 18026 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 33.

The square root of 31297380 is about 5594.4061347028. The cubic root of 31297380 is about 315.1393689154.

The spelling of 31297380 in words is "thirty-one million, two hundred ninety-seven thousand, three hundred eighty".