1866978872 has 32 divisors (see below), whose sum is σ = 3821111280. Its totient is φ = 848117760.

The previous prime is 1866978863. The next prime is 1866978887. The reversal of 1866978872 is 2788796681.

It is a super-2 number, since 2×1866978872² = 6971220216988784768, which contains 22 as substring.

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, 168248 + ... + 179000.

Almost surely, 2^1866978872 is an apocalyptic number.

It is an amenable number.

1866978872 is an abundant number, since it is smaller than the sum of its proper divisors (1954132408).

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

1866978872 is a wasteful number, since it uses less digits than its factorization.

1866978872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12743 (or 12739 counting only the distinct ones).

The product of its digits is 16257024, while the sum is 62.

The square root of 1866978872 is about 43208.5509129848. The cubic root of 1866978872 is about 1231.3451413094.

The spelling of 1866978872 in words is "one billion, eight hundred sixty-six million, nine hundred seventy-eight thousand, eight hundred seventy-two".