18390528 has 120 divisors (see below), whose sum is σ = 57345288. Its totient is φ = 5640192.

The previous prime is 18390527. The next prime is 18390529. The reversal of 18390528 is 82509381.

It is an interprime number because it is at equal distance from previous prime (18390527) and next prime (18390529).

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

It is a junction number, because it is equal to n+sod(n) for n = 18390492 and 18390501.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18390527) 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, 59751 + ... + 60057.

Almost surely, 2^18390528 is an apocalyptic number.

18390528 is a gapful number since it is divisible by the number (18) 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 18390528, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28672644).

18390528 is an abundant number, since it is smaller than the sum of its proper divisors (38954760).

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

18390528 is a wasteful number, since it uses less digits than its factorization.

18390528 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 344 (or 325 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 36.

The square root of 18390528 is about 4288.4178900849. The cubic root of 18390528 is about 263.9559155039.

The spelling of 18390528 in words is "eighteen million, three hundred ninety thousand, five hundred twenty-eight".