18073998 has 48 divisors (see below), whose sum is σ = 41277600. Its totient is φ = 5704512.

The previous prime is 18073981. The next prime is 18074027. The reversal of 18073998 is 89937081.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 61540 + ... + 61832.

It is an arithmetic number, because the mean of its divisors is an integer number (859950).

Almost surely, 2^18073998 is an apocalyptic number.

18073998 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 18073998, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20638800).

18073998 is an abundant number, since it is smaller than the sum of its proper divisors (23203602).

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

18073998 is a wasteful number, since it uses less digits than its factorization.

18073998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 473 (or 470 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 45.

The square root of 18073998 is about 4251.3524906787. The cubic root of 18073998 is about 262.4327773445.

The spelling of 18073998 in words is "eighteen million, seventy-three thousand, nine hundred ninety-eight".