1231396580 has 12 divisors (see below), whose sum is σ = 2585932860. Its totient is φ = 492558624.

The previous prime is 1231396571. The next prime is 1231396591. The reversal of 1231396580 is 856931321.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 155950144 + 1075446436 = 12488^2 + 32794^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30784895 + ... + 30784934.

It is an arithmetic number, because the mean of its divisors is an integer number (215494405).

Almost surely, 2^1231396580 is an apocalyptic number.

1231396580 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1231396580 is an abundant number, since it is smaller than the sum of its proper divisors (1354536280).

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

1231396580 is a wasteful number, since it uses less digits than its factorization.

1231396580 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61569838 (or 61569836 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 38.

The square root of 1231396580 is about 35091.2607354025. The cubic root of 1231396580 is about 1071.8466321488.

The spelling of 1231396580 in words is "one billion, two hundred thirty-one million, three hundred ninety-six thousand, five hundred eighty".