18212504 has 16 divisors (see below), whose sum is σ = 35633520. Its totient is φ = 8710240.

The previous prime is 18212503. The next prime is 18212561. The reversal of 18212504 is 40521281.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a self number, because there is not a number n which added to its sum of digits gives 18212504.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18212503) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 49307 + ... + 49674.

It is an arithmetic number, because the mean of its divisors is an integer number (2227095).

Almost surely, 2^18212504 is an apocalyptic number.

It is an amenable number.

18212504 is a deficient number, since it is larger than the sum of its proper divisors (17421016).

18212504 is a wasteful number, since it uses less digits than its factorization.

18212504 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99010 (or 99006 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 23.

The square root of 18212504 is about 4267.6110413204. The cubic root of 18212504 is about 263.1014369663.

Adding to 18212504 its reverse (40521281), we get a palindrome (58733785).

The spelling of 18212504 in words is "eighteen million, two hundred twelve thousand, five hundred four".