1977308538 has 32 divisors (see below), whose sum is σ = 4011759360. Its totient is φ = 649608960.

The previous prime is 1977308521. The next prime is 1977308561. The reversal of 1977308538 is 8358037791.

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, 289078 + ... + 295838.

It is an arithmetic number, because the mean of its divisors is an integer number (125367480).

Almost surely, 2^1977308538 is an apocalyptic number.

1977308538 is an abundant number, since it is smaller than the sum of its proper divisors (2034450822).

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

1977308538 is a wasteful number, since it uses less digits than its factorization.

1977308538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7462.

The product of its (nonzero) digits is 1270080, while the sum is 51.

The square root of 1977308538 is about 44466.9375828829. The cubic root of 1977308538 is about 1255.1380065480.

The spelling of 1977308538 in words is "one billion, nine hundred seventy-seven million, three hundred eight thousand, five hundred thirty-eight".