1306511972 has 24 divisors (see below), whose sum is σ = 2409570240. Its totient is φ = 618144480.

The previous prime is 1306511971. The next prime is 1306512001. The reversal of 1306511972 is 2791156031.

It is not an unprimeable number, because it can be changed into a prime (1306511971) 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, 57722 + ... + 77102.

It is an arithmetic number, because the mean of its divisors is an integer number (100398760).

Almost surely, 2^1306511972 is an apocalyptic number.

It is an amenable number.

1306511972 is a deficient number, since it is larger than the sum of its proper divisors (1103058268).

1306511972 is a wasteful number, since it uses less digits than its factorization.

1306511972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20291 (or 20289 counting only the distinct ones).

The product of its (nonzero) digits is 11340, while the sum is 35.

The square root of 1306511972 is about 36145.7047517406. The cubic root of 1306511972 is about 1093.2121871107.

The spelling of 1306511972 in words is "one billion, three hundred six million, five hundred eleven thousand, nine hundred seventy-two".