18253145 has 24 divisors (see below), whose sum is σ = 23464896. Its totient is φ = 13625568.

The previous prime is 18253127. The next prime is 18253153. The reversal of 18253145 is 54135281.

18253145 = 293² + 294² + ... + 430².

It is not a de Polignac number, because 18253145 - 2¹⁴ = 18236761 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 177164 + ... + 177266.

It is an arithmetic number, because the mean of its divisors is an integer number (977704).

Almost surely, 2^18253145 is an apocalyptic number.

It is an amenable number.

18253145 is a deficient number, since it is larger than the sum of its proper divisors (5211751).

18253145 is a wasteful number, since it uses less digits than its factorization.

18253145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 221 (or 198 counting only the distinct ones).

The product of its digits is 4800, while the sum is 29.

The square root of 18253145 is about 4272.3699512097. The cubic root of 18253145 is about 263.2969942200.

The spelling of 18253145 in words is "eighteen million, two hundred fifty-three thousand, one hundred forty-five".