31224132 has 18 divisors (see below), whose sum is σ = 78927758. Its totient is φ = 10408032.

The previous prime is 31224113. The next prime is 31224199. The reversal of 31224132 is 23142213.

It can be written as a sum of positive squares in only one way, i.e., 31203396 + 20736 = 5586^2 + 144^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (18).

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

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 433633 + ... + 433704.

Almost surely, 2^31224132 is an apocalyptic number.

It is an amenable number.

31224132 is an abundant number, since it is smaller than the sum of its proper divisors (47703626).

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

31224132 is a wasteful number, since it uses less digits than its factorization.

31224132 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 867347 (or 867342 counting only the distinct ones).

The product of its digits is 288, while the sum is 18.

The square root of 31224132 is about 5587.8557604863. The cubic root of 31224132 is about 314.8933274478.

Adding to 31224132 its reverse (23142213), we get a palindrome (54366345).

The spelling of 31224132 in words is "thirty-one million, two hundred twenty-four thousand, one hundred thirty-two".