18320265 has 24 divisors (see below), whose sum is σ = 31861440. Its totient is φ = 9738144.

The previous prime is 18320261. The next prime is 18320311. The reversal of 18320265 is 56202381.

It is not a de Polignac number, because 18320265 - 2² = 18320261 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18320261) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 19476 + ... + 20394.

It is an arithmetic number, because the mean of its divisors is an integer number (1327560).

Almost surely, 2^18320265 is an apocalyptic number.

18320265 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18320265 is a deficient number, since it is larger than the sum of its proper divisors (13541175).

18320265 is a wasteful number, since it uses less digits than its factorization.

18320265 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1373 (or 1370 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 18320265 is about 4280.2178682866. The cubic root of 18320265 is about 263.6193291159.

The spelling of 18320265 in words is "eighteen million, three hundred twenty thousand, two hundred sixty-five".