18018775 has 12 divisors (see below), whose sum is σ = 23315472. Its totient is φ = 13787840.

The previous prime is 18018769. The next prime is 18018839. The reversal of 18018775 is 57781081.

It is not a de Polignac number, because 18018775 - 2⁹ = 18018263 is a prime.

It is a Duffinian number.

It is a congruent 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, 15094 + ... + 16243.

It is an arithmetic number, because the mean of its divisors is an integer number (1942956).

Almost surely, 2^18018775 is an apocalyptic number.

18018775 is a deficient number, since it is larger than the sum of its proper divisors (5296697).

18018775 is a wasteful number, since it uses less digits than its factorization.

18018775 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31370 (or 31365 counting only the distinct ones).

The product of its (nonzero) digits is 15680, while the sum is 37.

The square root of 18018775 is about 4244.8527654089. The cubic root of 18018775 is about 262.1652270541.

The spelling of 18018775 in words is "eighteen million, eighteen thousand, seven hundred seventy-five".