18039492 has 36 divisors (see below), whose sum is σ = 46184320. Its totient is φ = 5936112.

The previous prime is 18039491. The next prime is 18039503. The reversal of 18039492 is 29493081.

18039492 is a `hidden beast` number, since 180 + 394 + 92 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (18039491) 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, 328 + ... + 6015.

Almost surely, 2^18039492 is an apocalyptic number.

18039492 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 18039492, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23092160).

18039492 is an abundant number, since it is smaller than the sum of its proper divisors (28144828).

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

18039492 is a wasteful number, since it uses less digits than its factorization.

18039492 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6432 (or 6427 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 36.

The square root of 18039492 is about 4247.2923139337. The cubic root of 18039492 is about 262.2656629755.

The spelling of 18039492 in words is "eighteen million, thirty-nine thousand, four hundred ninety-two".