18644252 has 24 divisors (see below), whose sum is σ = 35707392. Its totient is φ = 8447600.

The previous prime is 18644251. The next prime is 18644261. The reversal of 18644252 is 25244681.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18644251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21173 + ... + 22035.

It is an arithmetic number, because the mean of its divisors is an integer number (1487808).

Almost surely, 2^18644252 is an apocalyptic number.

It is an amenable number.

18644252 is a deficient number, since it is larger than the sum of its proper divisors (17063140).

18644252 is a wasteful number, since it uses less digits than its factorization.

18644252 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1369 (or 1367 counting only the distinct ones).

The product of its digits is 15360, while the sum is 32.

The square root of 18644252 is about 4317.8990261469. The cubic root of 18644252 is about 265.1642603314.

It can be divided in two parts, 1864 and 4252, that added together give a palindrome (6116).

The spelling of 18644252 in words is "eighteen million, six hundred forty-four thousand, two hundred fifty-two".