18223504 has 20 divisors (see below), whose sum is σ = 38024476. Its totient is φ = 8410752.

The previous prime is 18223463. The next prime is 18223547. The reversal of 18223504 is 40532281.

It can be written as a sum of positive squares in 2 ways, for example, as 10112400 + 8111104 = 3180^2 + 2848^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43599 + ... + 44014.

Almost surely, 2^18223504 is an apocalyptic number.

It is an amenable number.

18223504 is an abundant number, since it is smaller than the sum of its proper divisors (19800972).

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

18223504 is a wasteful number, since it uses less digits than its factorization.

18223504 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87634 (or 87628 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 25.

The square root of 18223504 is about 4268.8996240249. The cubic root of 18223504 is about 263.1543956980.

Adding to 18223504 its reverse (40532281), we get a palindrome (58755785).

The spelling of 18223504 in words is "eighteen million, two hundred twenty-three thousand, five hundred four".