1309499972 has 24 divisors (see below), whose sum is σ = 2514419712. Its totient is φ = 591783200.

The previous prime is 1309499897. The next prime is 1309499977. The reversal of 1309499972 is 2799949031.

It is not an unprimeable number, because it can be changed into a prime (1309499977) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 78404 + ... + 93627.

It is an arithmetic number, because the mean of its divisors is an integer number (104767488).

Almost surely, 2^1309499972 is an apocalyptic number.

It is an amenable number.

1309499972 is a deficient number, since it is larger than the sum of its proper divisors (1204919740).

1309499972 is a wasteful number, since it uses less digits than its factorization.

1309499972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 172219 (or 172217 counting only the distinct ones).

The product of its (nonzero) digits is 1102248, while the sum is 53.

The square root of 1309499972 is about 36187.0138585653. The cubic root of 1309499972 is about 1094.0449466676.

The spelling of 1309499972 in words is "one billion, three hundred nine million, four hundred ninety-nine thousand, nine hundred seventy-two".