19871992 has 32 divisors (see below), whose sum is σ = 43960320. Its totient is φ = 8241120.

The previous prime is 19871953. The next prime is 19872001. The reversal of 19871992 is 29917891.

It is a happy number.

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, 3988 + ... + 7459.

It is an arithmetic number, because the mean of its divisors is an integer number (1373760).

Almost surely, 2^19871992 is an apocalyptic number.

It is an amenable number.

19871992 is an abundant number, since it is smaller than the sum of its proper divisors (24088328).

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

19871992 is a wasteful number, since it uses less digits than its factorization.

19871992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11491 (or 11487 counting only the distinct ones).

The product of its digits is 81648, while the sum is 46.

The square root of 19871992 is about 4457.8012517383. The cubic root of 19871992 is about 270.8614097810.

The spelling of 19871992 in words is "nineteen million, eight hundred seventy-one thousand, nine hundred ninety-two".