1987205892 has 24 divisors (see below), whose sum is σ = 5299215936. Its totient is φ = 567773088.

The previous prime is 1987205881. The next prime is 1987205893. The reversal of 1987205892 is 2985027891.

It is not an unprimeable number, because it can be changed into a prime (1987205893) 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, 11828523 + ... + 11828690.

It is an arithmetic number, because the mean of its divisors is an integer number (220800664).

Almost surely, 2^1987205892 is an apocalyptic number.

1987205892 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1987205892 is an abundant number, since it is smaller than the sum of its proper divisors (3312010044).

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

1987205892 is a wasteful number, since it uses less digits than its factorization.

1987205892 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23657227 (or 23657225 counting only the distinct ones).

The product of its (nonzero) digits is 725760, while the sum is 51.

The square root of 1987205892 is about 44578.0875767456. The cubic root of 1987205892 is about 1257.2287063544.

The spelling of 1987205892 in words is "one billion, nine hundred eighty-seven million, two hundred five thousand, eight hundred ninety-two".