2018391618 has 8 divisors (see below), whose sum is σ = 4036783248. Its totient is φ = 672797204.

The previous prime is 2018391601. The next prime is 2018391637. The reversal of 2018391618 is 8161938102.

It is a sphenic number, since it is the product of 3 distinct primes.

2018391618 is an admirable number.

It is a super-2 number, since 2×2018391618² = 8147809447225315848, which contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 168199296 + ... + 168199307.

It is an arithmetic number, because the mean of its divisors is an integer number (504597906).

Almost surely, 2^2018391618 is an apocalyptic number.

2018391618 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

2018391618 is a wasteful number, since it uses less digits than its factorization.

2018391618 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 336398608.

The product of its (nonzero) digits is 20736, while the sum is 39.

The square root of 2018391618 is about 44926.5135304310. The cubic root of 2018391618 is about 1263.7712697167.

The spelling of 2018391618 in words is "two billion, eighteen million, three hundred ninety-one thousand, six hundred eighteen".