1987776404 has 24 divisors (see below), whose sum is σ = 3496566528. Its totient is φ = 988771040.

The previous prime is 1987776397. The next prime is 1987776443. The reversal of 1987776404 is 4046777891.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 811109 + ... + 813555.

It is an arithmetic number, because the mean of its divisors is an integer number (145690272).

Almost surely, 2^1987776404 is an apocalyptic number.

It is an amenable number.

1987776404 is a deficient number, since it is larger than the sum of its proper divisors (1508790124).

1987776404 is a wasteful number, since it uses less digits than its factorization.

1987776404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3415 (or 3413 counting only the distinct ones).

The product of its (nonzero) digits is 2370816, while the sum is 53.

The square root of 1987776404 is about 44584.4861358747. The cubic root of 1987776404 is about 1257.3490085062.

The spelling of 1987776404 in words is "one billion, nine hundred eighty-seven million, seven hundred seventy-six thousand, four hundred four".