18538072 has 72 divisors (see below), whose sum is σ = 42999660. Its totient is φ = 7469280.

The previous prime is 18538001. The next prime is 18538099. The reversal of 18538072 is 27083581.

It is a super-2 number, since 2×18538072² = 687320226954368, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 141447 + ... + 141577.

Almost surely, 2^18538072 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18538072, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21499830).

18538072 is an abundant number, since it is smaller than the sum of its proper divisors (24461588).

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

18538072 is a wasteful number, since it uses less digits than its factorization.

18538072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 189 (or 159 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 34.

The square root of 18538072 is about 4305.5861389595. The cubic root of 18538072 is about 264.6599268912.

The spelling of 18538072 in words is "eighteen million, five hundred thirty-eight thousand, seventy-two".