1272931899 has 16 divisors (see below), whose sum is σ = 1830991392. Its totient is φ = 783630848.

The previous prime is 1272931859. The next prime is 1272931921. The reversal of 1272931899 is 9981392721.

It is a cyclic number.

It is not a de Polignac number, because 1272931899 - 2⁸ = 1272931643 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is not an unprimeable number, because it can be changed into a prime (1272931859) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 232764 + ... + 238169.

It is an arithmetic number, because the mean of its divisors is an integer number (114436962).

Almost surely, 2^1272931899 is an apocalyptic number.

1272931899 is a deficient number, since it is larger than the sum of its proper divisors (558059493).

1272931899 is a wasteful number, since it uses less digits than its factorization.

1272931899 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 471006.

The product of its digits is 489888, while the sum is 51.

The square root of 1272931899 is about 35678.1711835122. The cubic root of 1272931899 is about 1083.7648382074.

The spelling of 1272931899 in words is "one billion, two hundred seventy-two million, nine hundred thirty-one thousand, eight hundred ninety-nine".