3131204040 has 160 divisors (see below), whose sum is σ = 10585080000. Its totient is φ = 830169216.

The previous prime is 3131204033. The next prime is 3131204053. The reversal of 3131204040 is 404021313.

It is a super-2 number, since 2×3131204040² = 19608877480224643200, which contains 22 as substring.

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

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 577261 + ... + 582659.

It is an arithmetic number, because the mean of its divisors is an integer number (66156750).

Almost surely, 2^3131204040 is an apocalyptic number.

3131204040 is a gapful number since it is divisible by the number (30) 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 3131204040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5292540000).

3131204040 is an abundant number, since it is smaller than the sum of its proper divisors (7453875960).

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

3131204040 is a wasteful number, since it uses less digits than its factorization.

3131204040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5601 (or 5588 counting only the distinct ones).

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

The square root of 3131204040 is about 55957.1625442177. The cubic root of 3131204040 is about 1462.9757347784.

Adding to 3131204040 its reverse (404021313), we get a palindrome (3535225353).

The spelling of 3131204040 in words is "three billion, one hundred thirty-one million, two hundred four thousand, forty".