18090432 has 168 divisors, whose sum is σ = 58064400. Its totient is φ = 5515776.

The previous prime is 18090427. The next prime is 18090463. The reversal of 18090432 is 23409081.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 18090396 and 18090405.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 623794 + ... + 623822.

Almost surely, 2^18090432 is an apocalyptic number.

18090432 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 18090432, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29032200).

18090432 is an abundant number, since it is smaller than the sum of its proper divisors (39973968).

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

18090432 is a wasteful number, since it uses less digits than its factorization.

18090432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88 (or 53 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 18090432 is about 4253.2848482085. The cubic root of 18090432 is about 262.5122933018.

The spelling of 18090432 in words is "eighteen million, ninety thousand, four hundred thirty-two".