18225315 has 24 divisors (see below), whose sum is σ = 32965920. Its totient is φ = 9297024.

The previous prime is 18225307. The next prime is 18225323. The reversal of 18225315 is 51352281.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (18225307) and next prime (18225323).

It is not a de Polignac number, because 18225315 - 2³ = 18225307 is a prime.

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, 7770 + ... + 9839.

It is an arithmetic number, because the mean of its divisors is an integer number (1373580).

Almost surely, 2^18225315 is an apocalyptic number.

18225315 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

18225315 is a deficient number, since it is larger than the sum of its proper divisors (14740605).

18225315 is a wasteful number, since it uses less digits than its factorization.

18225315 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17643 (or 17640 counting only the distinct ones).

The product of its digits is 2400, while the sum is 27.

The square root of 18225315 is about 4269.1117343073. Note that the first 3 decimals coincide. The cubic root of 18225315 is about 263.1631125878.

Adding to 18225315 its reverse (51352281), we get a palindrome (69577596).

The spelling of 18225315 in words is "eighteen million, two hundred twenty-five thousand, three hundred fifteen".