1987409904 has 40 divisors (see below), whose sum is σ = 5311185360. Its totient is φ = 639625728.

The previous prime is 1987409903. The next prime is 1987409909. The reversal of 1987409904 is 4099047891.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1987409903) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 712477 + ... + 715260.

It is an arithmetic number, because the mean of its divisors is an integer number (132779634).

Almost surely, 2^1987409904 is an apocalyptic number.

It is an amenable number.

1987409904 is an abundant number, since it is smaller than the sum of its proper divisors (3323775456).

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

1987409904 is a wasteful number, since it uses less digits than its factorization.

1987409904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1427777 (or 1427771 counting only the distinct ones).

The product of its (nonzero) digits is 653184, while the sum is 51.

The square root of 1987409904 is about 44580.3757723059. The cubic root of 1987409904 is about 1257.2717283964.

The spelling of 1987409904 in words is "one billion, nine hundred eighty-seven million, four hundred nine thousand, nine hundred four".