18018459 has 12 divisors (see below), whose sum is σ = 26063856. Its totient is φ = 11995152.

The previous prime is 18018443. The next prime is 18018461. The reversal of 18018459 is 95481081.

It is not a de Polignac number, because 18018459 - 2⁴ = 18018443 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18018059) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10189 + ... + 11825.

It is an arithmetic number, because the mean of its divisors is an integer number (2171988).

Almost surely, 2^18018459 is an apocalyptic number.

18018459 is a deficient number, since it is larger than the sum of its proper divisors (8045397).

18018459 is a wasteful number, since it uses less digits than its factorization.

18018459 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2866 (or 2863 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 36.

The square root of 18018459 is about 4244.8155436956. The cubic root of 18018459 is about 262.1636944916.

The spelling of 18018459 in words is "eighteen million, eighteen thousand, four hundred fifty-nine".