1977021838 has 32 divisors (see below), whose sum is σ = 3386603520. Its totient is φ = 857388000.

The previous prime is 1977021821. The next prime is 1977021853. The reversal of 1977021838 is 8381207791.

It is a congruent number.

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, 28008 + ... + 68836.

It is an arithmetic number, because the mean of its divisors is an integer number (105831360).

Almost surely, 2^1977021838 is an apocalyptic number.

1977021838 is a deficient number, since it is larger than the sum of its proper divisors (1409581682).

1977021838 is a wasteful number, since it uses less digits than its factorization.

1977021838 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40944.

The product of its (nonzero) digits is 169344, while the sum is 46.

The square root of 1977021838 is about 44463.7137225401. The cubic root of 1977021838 is about 1255.0773406727.

The spelling of 1977021838 in words is "one billion, nine hundred seventy-seven million, twenty-one thousand, eight hundred thirty-eight".