31147872 has 48 divisors (see below), whose sum is σ = 93445632. Its totient is φ = 8899200.

The previous prime is 31147871. The next prime is 31147891. The reversal of 31147872 is 27874113.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (48).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31147871) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 22504 + ... + 23847.

It is an arithmetic number, because the mean of its divisors is an integer number (1946784).

Almost surely, 2^31147872 is an apocalyptic number.

31147872 is a gapful number since it is divisible by the number (32) formed by its first and last digit.

It is an amenable number.

31147872 is an abundant number, since it is smaller than the sum of its proper divisors (62297760).

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

31147872 is a wasteful number, since it uses less digits than its factorization.

31147872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46371 (or 46363 counting only the distinct ones).

The product of its digits is 9408, while the sum is 33.

The square root of 31147872 is about 5581.0278623207. The cubic root of 31147872 is about 314.6367594226.

The spelling of 31147872 in words is "thirty-one million, one hundred forty-seven thousand, eight hundred seventy-two".