31447140 has 24 divisors (see below), whose sum is σ = 88052160. Its totient is φ = 8385888.

The previous prime is 31447133. The next prime is 31447181. The reversal of 31447140 is 4174413.

It is a super-2 number, since 2×31447140² = 1977845228359200, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 31447140.

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, 262000 + ... + 262119.

It is an arithmetic number, because the mean of its divisors is an integer number (3668840).

Almost surely, 2^31447140 is an apocalyptic number.

31447140 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

31447140 is an abundant number, since it is smaller than the sum of its proper divisors (56605020).

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

31447140 is a wasteful number, since it uses less digits than its factorization.

31447140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 524131 (or 524129 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 24.

The square root of 31447140 is about 5607.7749598214. The cubic root of 31447140 is about 315.6412234251.

The spelling of 31447140 in words is "thirty-one million, four hundred forty-seven thousand, one hundred forty".