1309431656 has 32 divisors (see below), whose sum is σ = 2700311040. Its totient is φ = 591492288.

The previous prime is 1309431581. The next prime is 1309431671. The reversal of 1309431656 is 6561349031.

It is a super-2 number, since 2×1309431656² = 3429222523469804672, which contains 22 as substring.

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, 129056 + ... + 138831.

It is an arithmetic number, because the mean of its divisors is an integer number (84384720).

Almost surely, 2^1309431656 is an apocalyptic number.

It is an amenable number.

1309431656 is an abundant number, since it is smaller than the sum of its proper divisors (1390879384).

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

1309431656 is a wasteful number, since it uses less digits than its factorization.

1309431656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 267953 (or 267949 counting only the distinct ones).

The product of its (nonzero) digits is 58320, while the sum is 38.

The square root of 1309431656 is about 36186.0699164748. The cubic root of 1309431656 is about 1094.0259210660.

The spelling of 1309431656 in words is "one billion, three hundred nine million, four hundred thirty-one thousand, six hundred fifty-six".