18538992 has 60 divisors (see below), whose sum is σ = 53569984. Its totient is φ = 5978880.

The previous prime is 18538981. The next prime is 18538997. The reversal of 18538992 is 29983581.

It is a happy number.

18538992 is a `hidden beast` number, since 185 + 389 + 92 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18538997) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2388 + ... + 6540.

Almost surely, 2^18538992 is an apocalyptic number.

18538992 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18538992, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26784992).

18538992 is an abundant number, since it is smaller than the sum of its proper divisors (35030992).

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

18538992 is a wasteful number, since it uses less digits than its factorization.

18538992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4198 (or 4189 counting only the distinct ones).

The product of its digits is 155520, while the sum is 45.

The square root of 18538992 is about 4305.6929755848. The cubic root of 18538992 is about 264.6643049643.

The spelling of 18538992 in words is "eighteen million, five hundred thirty-eight thousand, nine hundred ninety-two".