1977775842 has 32 divisors (see below), whose sum is σ = 4717181952. Its totient is φ = 540509904.

The previous prime is 1977775829. The next prime is 1977775867. The reversal of 1977775842 is 2485777791.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1022728 + ... + 1024659.

It is an arithmetic number, because the mean of its divisors is an integer number (147411936).

Almost surely, 2^1977775842 is an apocalyptic number.

1977775842 is an abundant number, since it is smaller than the sum of its proper divisors (2739406110).

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

1977775842 is a wasteful number, since it uses less digits than its factorization.

1977775842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2047422.

The product of its digits is 6914880, while the sum is 57.

The square root of 1977775842 is about 44472.1917831806. The cubic root of 1977775842 is about 1255.2368757601.

The spelling of 1977775842 in words is "one billion, nine hundred seventy-seven million, seven hundred seventy-five thousand, eight hundred forty-two".