18355372 has 48 divisors (see below), whose sum is σ = 38384640. Its totient is φ = 7516800.

The previous prime is 18355319. The next prime is 18355373. The reversal of 18355372 is 27355381.

It is not an unprimeable number, because it can be changed into a prime (18355373) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 67597 + ... + 67867.

It is an arithmetic number, because the mean of its divisors is an integer number (799680).

Almost surely, 2^18355372 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18355372, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19192320).

18355372 is an abundant number, since it is smaller than the sum of its proper divisors (20029268).

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

18355372 is a wasteful number, since it uses less digits than its factorization.

18355372 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 382 (or 380 counting only the distinct ones).

The product of its digits is 25200, while the sum is 34.

The square root of 18355372 is about 4284.3169817370. The cubic root of 18355372 is about 263.7876123146.

Subtracting 18355372 from its reverse (27355381), we obtain a palindrome (9000009).

It can be divided in two parts, 183 and 55372, that added together give a palindrome (55555).

The spelling of 18355372 in words is "eighteen million, three hundred fifty-five thousand, three hundred seventy-two".