31397190 has 32 divisors (see below), whose sum is σ = 82204416. Its totient is φ = 7611360.

The previous prime is 31397189. The next prime is 31397209. The reversal of 31397190 is 9179313.

It is a super-2 number, since 2×31397190² = 1971567079792200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

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, 47242 + ... + 47901.

It is an arithmetic number, because the mean of its divisors is an integer number (2568888).

Almost surely, 2^31397190 is an apocalyptic number.

31397190 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

31397190 is an abundant number, since it is smaller than the sum of its proper divisors (50807226).

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

31397190 is a wasteful number, since it uses less digits than its factorization.

31397190 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95164.

The product of its (nonzero) digits is 5103, while the sum is 33.

The square root of 31397190 is about 5603.3195518371. The cubic root of 31397190 is about 315.4740154894.

The spelling of 31397190 in words is "thirty-one million, three hundred ninety-seven thousand, one hundred ninety".