18378025 has 12 divisors (see below), whose sum is σ = 23575500. Its totient is φ = 14194880.

The previous prime is 18378013. The next prime is 18378029. The reversal of 18378025 is 52087381.

It can be written as a sum of positive squares in 6 ways, for example, as 670761 + 17707264 = 819^2 + 4208^2 .

It is not a de Polignac number, because 18378025 - 2⁵ = 18377993 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18378029) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 11950 + ... + 13399.

It is an arithmetic number, because the mean of its divisors is an integer number (1964625).

Almost surely, 2^18378025 is an apocalyptic number.

It is an amenable number.

18378025 is a deficient number, since it is larger than the sum of its proper divisors (5197475).

18378025 is a wasteful number, since it uses less digits than its factorization.

18378025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25388 (or 25383 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 34.

The square root of 18378025 is about 4286.9598785153. The cubic root of 18378025 is about 263.8960841785.

The spelling of 18378025 in words is "eighteen million, three hundred seventy-eight thousand, twenty-five".