1272791990 has 16 divisors (see below), whose sum is σ = 2292133248. Its totient is φ = 508870656.

The previous prime is 1272791953. The next prime is 1272792041. The reversal of 1272791990 is 991972721.

It is a congruent number.

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, 8267 + ... + 51126.

It is an arithmetic number, because the mean of its divisors is an integer number (143258328).

Almost surely, 2^1272791990 is an apocalyptic number.

1272791990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1272791990 is a deficient number, since it is larger than the sum of its proper divisors (1019341258).

1272791990 is a wasteful number, since it uses less digits than its factorization.

1272791990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61543.

The product of its (nonzero) digits is 142884, while the sum is 47.

The square root of 1272791990 is about 35676.2104209514. The cubic root of 1272791990 is about 1083.7251309221.

The spelling of 1272791990 in words is "one billion, two hundred seventy-two million, seven hundred ninety-one thousand, nine hundred ninety".