1299275172 has 72 divisors (see below), whose sum is σ = 3541190016. Its totient is φ = 399294144.

The previous prime is 1299275137. The next prime is 1299275249. The reversal of 1299275172 is 2715729921.

1299275172 is a `hidden beast` number, since 129 + 9 + 2 + 7 + 517 + 2 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 694983 + ... + 696849.

Almost surely, 2^1299275172 is an apocalyptic number.

1299275172 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1299275172 is an abundant number, since it is smaller than the sum of its proper divisors (2241914844).

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

1299275172 is a wasteful number, since it uses less digits than its factorization.

1299275172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3377 (or 3372 counting only the distinct ones).

The product of its digits is 158760, while the sum is 45.

The square root of 1299275172 is about 36045.4597973171. The cubic root of 1299275172 is about 1091.1900063458.

The spelling of 1299275172 in words is "one billion, two hundred ninety-nine million, two hundred seventy-five thousand, one hundred seventy-two".