18471864 has 16 divisors (see below), whose sum is σ = 46179720. Its totient is φ = 6157280.

The previous prime is 18471863. The next prime is 18471881. The reversal of 18471864 is 46817481.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18471863) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 384807 + ... + 384854.

Almost surely, 2^18471864 is an apocalyptic number.

It is an amenable number.

18471864 is an abundant number, since it is smaller than the sum of its proper divisors (27707856).

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

18471864 is a wasteful number, since it uses less digits than its factorization.

18471864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 769670 (or 769666 counting only the distinct ones).

The product of its digits is 43008, while the sum is 39.

The square root of 18471864 is about 4297.8906454213. The cubic root of 18471864 is about 264.3444768566.

The spelling of 18471864 in words is "eighteen million, four hundred seventy-one thousand, eight hundred sixty-four".