31380870 has 16 divisors (see below), whose sum is σ = 75314160. Its totient is φ = 8368224.

The previous prime is 31380859. The next prime is 31380893. The reversal of 31380870 is 7808313.

It is a Harshad number since it is a multiple of its sum of digits (30), and also a Moran number because the ratio is a prime number: 1046029 = 31380870 / (3 + 1 + 3 + 8 + 0 + 8 + 7 + 0).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 522985 + ... + 523044.

It is an arithmetic number, because the mean of its divisors is an integer number (4707135).

Almost surely, 2^31380870 is an apocalyptic number.

31380870 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

31380870 is an abundant number, since it is smaller than the sum of its proper divisors (43933290).

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

31380870 is a wasteful number, since it uses less digits than its factorization.

31380870 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1046039.

The product of its (nonzero) digits is 4032, while the sum is 30.

The square root of 31380870 is about 5601.8630829395. The cubic root of 31380870 is about 315.4193457536.

The spelling of 31380870 in words is "thirty-one million, three hundred eighty thousand, eight hundred seventy".