31147392 has 64 divisors (see below), whose sum is σ = 85618800. Its totient is φ = 10020864.

The previous prime is 31147381. The next prime is 31147397. The reversal of 31147392 is 29374113.

It is a tau number, because it is divible by the number of its divisors (64).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31147397) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9738 + ... + 12534.

Almost surely, 2^31147392 is an apocalyptic number.

31147392 is a gapful number since it is divisible by the number (32) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31147392, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42809400).

31147392 is an abundant number, since it is smaller than the sum of its proper divisors (54471408).

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

31147392 is a wasteful number, since it uses less digits than its factorization.

31147392 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2843 (or 2831 counting only the distinct ones).

The product of its digits is 4536, while the sum is 30.

The square root of 31147392 is about 5580.9848593237. The cubic root of 31147392 is about 314.6351431921.

The spelling of 31147392 in words is "thirty-one million, one hundred forty-seven thousand, three hundred ninety-two".