18213325 has 12 divisors (see below), whose sum is σ = 24322228. Its totient is φ = 13449600.

The previous prime is 18213317. The next prime is 18213353. The reversal of 18213325 is 52331281.

It can be written as a sum of positive squares in 6 ways, for example, as 724201 + 17489124 = 851^2 + 4182^2 .

It is not a de Polignac number, because 18213325 - 2³ = 18213317 is a prime.

It is a hoax number, since the sum of its digits (25) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18213325.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 27696 + ... + 28345.

Almost surely, 2^18213325 is an apocalyptic number.

It is an amenable number.

18213325 is a deficient number, since it is larger than the sum of its proper divisors (6108903).

18213325 is a wasteful number, since it uses less digits than its factorization.

18213325 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56064 (or 56059 counting only the distinct ones).

The product of its digits is 1440, while the sum is 25.

The square root of 18213325 is about 4267.7072298835. The cubic root of 18213325 is about 263.1053903498.

The spelling of 18213325 in words is "eighteen million, two hundred thirteen thousand, three hundred twenty-five".