1272945516 has 24 divisors (see below), whose sum is σ = 3144924720. Its totient is φ = 399355392.

The previous prime is 1272945497. The next prime is 1272945523. The reversal of 1272945516 is 6155492721.

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, 3119761 + ... + 3120168.

It is an arithmetic number, because the mean of its divisors is an integer number (131038530).

Almost surely, 2^1272945516 is an apocalyptic number.

It is an amenable number.

1272945516 is an abundant number, since it is smaller than the sum of its proper divisors (1871979204).

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

1272945516 is a wasteful number, since it uses less digits than its factorization.

1272945516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6239953 (or 6239951 counting only the distinct ones).

The product of its digits is 151200, while the sum is 42.

The square root of 1272945516 is about 35678.3620139714. The cubic root of 1272945516 is about 1083.7687026648.

The spelling of 1272945516 in words is "one billion, two hundred seventy-two million, nine hundred forty-five thousand, five hundred sixteen".