18871974 has 32 divisors (see below), whose sum is σ = 45751680. Its totient is φ = 5718600.

The previous prime is 18871967. The next prime is 18871981. The reversal of 18871974 is 47917881.

It is an interprime number because it is at equal distance from previous prime (18871967) and next prime (18871981).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15292 + ... + 16479.

It is an arithmetic number, because the mean of its divisors is an integer number (1429740).

Almost surely, 2^18871974 is an apocalyptic number.

18871974 is an abundant number, since it is smaller than the sum of its proper divisors (26879706).

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

18871974 is a wasteful number, since it uses less digits than its factorization.

18871974 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31793 (or 31787 counting only the distinct ones).

The product of its digits is 112896, while the sum is 45.

The square root of 18871974 is about 4344.1885318204. The cubic root of 18871974 is about 266.2394719106.

The spelling of 18871974 in words is "eighteen million, eight hundred seventy-one thousand, nine hundred seventy-four".