2131304240 has 40 divisors (see below), whose sum is σ = 5336460528. Its totient is φ = 786942720.

The previous prime is 2131304207. The next prime is 2131304257. The reversal of 2131304240 is 424031312.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1023626 + ... + 1025705.

Almost surely, 2^2131304240 is an apocalyptic number.

2131304240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2131304240 is an abundant number, since it is smaller than the sum of its proper divisors (3205156288).

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

2131304240 is a wasteful number, since it uses less digits than its factorization.

2131304240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2049357 (or 2049351 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 2131304240 is about 46166.0507299466. The cubic root of 2131304240 is about 1286.9109108249.

Adding to 2131304240 its reverse (424031312), we get a palindrome (2555335552).

The spelling of 2131304240 in words is "two billion, one hundred thirty-one million, three hundred four thousand, two hundred forty".