18938265 has 16 divisors (see below), whose sum is σ = 31121088. Its totient is φ = 9827136.

The previous prime is 18938239. The next prime is 18938273. The reversal of 18938265 is 56283981.

It is not a de Polignac number, because 18938265 - 2¹⁰ = 18937241 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16507 + ... + 17616.

It is an arithmetic number, because the mean of its divisors is an integer number (1945068).

Almost surely, 2^18938265 is an apocalyptic number.

18938265 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18938265 is a deficient number, since it is larger than the sum of its proper divisors (12182823).

18938265 is a wasteful number, since it uses less digits than its factorization.

18938265 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34168.

The product of its digits is 103680, while the sum is 42.

The square root of 18938265 is about 4351.8116916981. The cubic root of 18938265 is about 266.5508446673.

The spelling of 18938265 in words is "eighteen million, nine hundred thirty-eight thousand, two hundred sixty-five".