31143204 has 60 divisors (see below), whose sum is σ = 85716400. Its totient is φ = 9832752.

The previous prime is 31143199. The next prime is 31143239. The reversal of 31143204 is 40234113.

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

It is an unprimeable number.

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 19 ways as a sum of consecutive naturals, for example, 3627 + ... + 8685.

Almost surely, 2^31143204 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31143204, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42858200).

31143204 is an abundant number, since it is smaller than the sum of its proper divisors (54573196).

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

31143204 is a wasteful number, since it uses less digits than its factorization.

31143204 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5094 (or 5083 counting only the distinct ones).

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

The square root of 31143204 is about 5580.6096441160. The cubic root of 31143204 is about 314.6210408766.

Adding to 31143204 its reverse (40234113), we get a palindrome (71377317).

Subtracting 31143204 from its reverse (40234113), we obtain a palindrome (9090909).

The spelling of 31143204 in words is "thirty-one million, one hundred forty-three thousand, two hundred four".