1977857044 has 36 divisors (see below), whose sum is σ = 3688466236. Its totient is φ = 927811584.

The previous prime is 1977857039. The next prime is 1977857093. The reversal of 1977857044 is 4407587791.

It can be written as a sum of positive squares in 6 ways, for example, as 428490000 + 1549367044 = 20700^2 + 39362^2 .

It is a Smith number, since the sum of its digits (52) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 1977856982 and 1977857000.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 387034 + ... + 392110.

Almost surely, 2^1977857044 is an apocalyptic number.

It is an amenable number.

1977857044 is a deficient number, since it is larger than the sum of its proper divisors (1710609192).

1977857044 is a wasteful number, since it uses less digits than its factorization.

1977857044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5452 (or 5433 counting only the distinct ones).

The product of its (nonzero) digits is 1975680, while the sum is 52.

The square root of 1977857044 is about 44473.1047263399. The cubic root of 1977857044 is about 1255.2540543752.

The spelling of 1977857044 in words is "one billion, nine hundred seventy-seven million, eight hundred fifty-seven thousand, forty-four".