1277792940 has 48 divisors (see below), whose sum is σ = 3766129920. Its totient is φ = 322810560.

The previous prime is 1277792933. The next prime is 1277792951. The reversal of 1277792940 is 492977721.

It is a self number, because there is not a number n which added to its sum of digits gives 1277792940.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 559296 + ... + 561575.

It is an arithmetic number, because the mean of its divisors is an integer number (78461040).

Almost surely, 2^1277792940 is an apocalyptic number.

1277792940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1277792940 is an abundant number, since it is smaller than the sum of its proper divisors (2488336980).

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

1277792940 is a wasteful number, since it uses less digits than its factorization.

1277792940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1120902 (or 1120900 counting only the distinct ones).

The product of its (nonzero) digits is 444528, while the sum is 48.

The square root of 1277792940 is about 35746.2297312598. The cubic root of 1277792940 is about 1085.1426373528.

The spelling of 1277792940 in words is "one billion, two hundred seventy-seven million, seven hundred ninety-two thousand, nine hundred forty".