18936225 has 72 divisors (see below), whose sum is σ = 42324672. Its totient is φ = 7862400.

The previous prime is 18936223. The next prime is 18936233. The reversal of 18936225 is 52263981.

It is not a de Polignac number, because 18936225 - 2¹ = 18936223 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18936225.

It is not an unprimeable number, because it can be changed into a prime (18936223) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 16779 + ... + 17871.

Almost surely, 2^18936225 is an apocalyptic number.

18936225 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18936225 is an abundant number, since it is smaller than the sum of its proper divisors (23388447).

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

18936225 is a wasteful number, since it uses less digits than its factorization.

18936225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1127 (or 1119 counting only the distinct ones).

The product of its digits is 25920, while the sum is 36.

The square root of 18936225 is about 4351.5773002441. The cubic root of 18936225 is about 266.5412735116.

It can be divided in two parts, 1893 and 6225, that added together give a palindrome (8118).

The spelling of 18936225 in words is "eighteen million, nine hundred thirty-six thousand, two hundred twenty-five".