18019974 has 32 divisors (see below), whose sum is σ = 41319936. Its totient is φ = 5132160.

The previous prime is 18019943. The next prime is 18019993. The reversal of 18019974 is 47991081.

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 15 ways as a sum of consecutive naturals, for example, 20014 + ... + 20894.

It is an arithmetic number, because the mean of its divisors is an integer number (1291248).

Almost surely, 2^18019974 is an apocalyptic number.

18019974 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

18019974 is an abundant number, since it is smaller than the sum of its proper divisors (23299962).

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

18019974 is a wasteful number, since it uses less digits than its factorization.

18019974 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1380.

The product of its (nonzero) digits is 18144, while the sum is 39.

The square root of 18019974 is about 4244.9939929286. The cubic root of 18019974 is about 262.1710418988.

The spelling of 18019974 in words is "eighteen million, nineteen thousand, nine hundred seventy-four".