18522432 has 98 divisors (see below), whose sum is σ = 55246778. Its totient is φ = 6158592.

The previous prime is 18522431. The next prime is 18522433. The reversal of 18522432 is 23422581.

It is an interprime number because it is at equal distance from previous prime (18522431) and next prime (18522433).

It can be written as a sum of positive squares in only one way, i.e., 16842816 + 1679616 = 4104^2 + 1296^2 .

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 = 18522396 and 18522405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18522431) by changing a digit.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 46458 + ... + 46854.

Almost surely, 2^18522432 is an apocalyptic number.

18522432 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 18522432, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27623389).

18522432 is an abundant number, since it is smaller than the sum of its proper divisors (36724346).

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

18522432 is an frugal number, since it uses more digits than its factorization.

18522432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 427 (or 402 counting only the distinct ones).

The product of its digits is 3840, while the sum is 27.

The square root of 18522432 is about 4303.7695105570. The cubic root of 18522432 is about 264.5854774759.

The spelling of 18522432 in words is "eighteen million, five hundred twenty-two thousand, four hundred thirty-two".