18313825 has 12 divisors (see below), whose sum is σ = 22937148. Its totient is φ = 14504000.

The previous prime is 18313787. The next prime is 18313837. The reversal of 18313825 is 52831381.

It can be written as a sum of positive squares in 6 ways, for example, as 1306449 + 17007376 = 1143^2 + 4124^2 .

It is not a de Polignac number, because 18313825 - 2¹³ = 18305633 is a prime.

It is a super-2 number, since 2×18313825² = 670792372261250, which contains 22 as substring.

It is a Duffinian 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, 1102 + ... + 6151.

It is an arithmetic number, because the mean of its divisors is an integer number (1911429).

Almost surely, 2^18313825 is an apocalyptic number.

It is an amenable number.

18313825 is a deficient number, since it is larger than the sum of its proper divisors (4623323).

18313825 is a wasteful number, since it uses less digits than its factorization.

18313825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7364 (or 7359 counting only the distinct ones).

The product of its digits is 5760, while the sum is 31.

The square root of 18313825 is about 4279.4655040086. The cubic root of 18313825 is about 263.5884360503.

The spelling of 18313825 in words is "eighteen million, three hundred thirteen thousand, eight hundred twenty-five".