18258018 has 16 divisors (see below), whose sum is σ = 36560160. Its totient is φ = 6078656.

The previous prime is 18258007. The next prime is 18258029. The reversal of 18258018 is 81085281.

It is an interprime number because it is at equal distance from previous prime (18258007) and next prime (18258029).

It is a self number, because there is not a number n which added to its sum of digits gives 18258018.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6346 + ... + 8762.

It is an arithmetic number, because the mean of its divisors is an integer number (2285010).

Almost surely, 2^18258018 is an apocalyptic number.

18258018 is an abundant number, since it is smaller than the sum of its proper divisors (18302142).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18258018 is a wasteful number, since it uses less digits than its factorization.

18258018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3681.

The product of its (nonzero) digits is 5120, while the sum is 33.

The square root of 18258018 is about 4272.9402055259. The cubic root of 18258018 is about 263.3204227322.

The spelling of 18258018 in words is "eighteen million, two hundred fifty-eight thousand, eighteen".