1291626972 has 30 divisors (see below), whose sum is σ = 3376568888. Its totient is φ = 430542216.

The previous prime is 1291626949. The next prime is 1291627009. The reversal of 1291626972 is 2796261921.

1291626972 is a `hidden beast` number, since 12 + 9 + 1 + 626 + 9 + 7 + 2 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 1992928 + ... + 1993575.

Almost surely, 2^1291626972 is an apocalyptic number.

1291626972 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1291626972 is an abundant number, since it is smaller than the sum of its proper divisors (2084941916).

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

1291626972 is a wasteful number, since it uses less digits than its factorization.

1291626972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3986519 (or 3986508 counting only the distinct ones).

The product of its digits is 163296, while the sum is 45.

The square root of 1291626972 is about 35939.2121783436. The cubic root of 1291626972 is about 1089.0446900131.

The spelling of 1291626972 in words is "one billion, two hundred ninety-one million, six hundred twenty-six thousand, nine hundred seventy-two".