18227225 has 24 divisors (see below), whose sum is σ = 24165120. Its totient is φ = 13608000.

The previous prime is 18227219. The next prime is 18227233. The reversal of 18227225 is 52272281.

It is a de Polignac number, because none of the positive numbers 2^k-18227225 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 22070 + ... + 22880.

It is an arithmetic number, because the mean of its divisors is an integer number (1006880).

Almost surely, 2^18227225 is an apocalyptic number.

It is an amenable number.

18227225 is a deficient number, since it is larger than the sum of its proper divisors (5937895).

18227225 is a wasteful number, since it uses less digits than its factorization.

18227225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 881 (or 876 counting only the distinct ones).

The product of its digits is 4480, while the sum is 29.

The square root of 18227225 is about 4269.3354283776. The cubic root of 18227225 is about 263.1723053687.

The spelling of 18227225 in words is "eighteen million, two hundred twenty-seven thousand, two hundred twenty-five".