18138275 has 6 divisors (see below), whose sum is σ = 22491492. Its totient is φ = 14510600.

The previous prime is 18138247. The next prime is 18138343. The reversal of 18138275 is 57283181.

It is not a de Polignac number, because 18138275 - 2¹⁴ = 18121891 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 362741 + ... + 362790.

It is an arithmetic number, because the mean of its divisors is an integer number (3748582).

Almost surely, 2^18138275 is an apocalyptic number.

18138275 is a deficient number, since it is larger than the sum of its proper divisors (4353217).

18138275 is an equidigital number, since it uses as much as digits as its factorization.

18138275 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 725541 (or 725536 counting only the distinct ones).

The product of its digits is 13440, while the sum is 35.

The square root of 18138275 is about 4258.9053757979. The cubic root of 18138275 is about 262.7435079781.

The spelling of 18138275 in words is "eighteen million, one hundred thirty-eight thousand, two hundred seventy-five".