18641418 has 32 divisors (see below), whose sum is σ = 39735360. Its totient is φ = 5809920.

The previous prime is 18641387. The next prime is 18641419. The reversal of 18641418 is 81414681.

It is not an unprimeable number, because it can be changed into a prime (18641419) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17748 + ... + 18768.

It is an arithmetic number, because the mean of its divisors is an integer number (1241730).

Almost surely, 2^18641418 is an apocalyptic number.

18641418 is an abundant number, since it is smaller than the sum of its proper divisors (21093942).

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

18641418 is a wasteful number, since it uses less digits than its factorization.

18641418 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1222.

The product of its digits is 6144, while the sum is 33.

The square root of 18641418 is about 4317.5708448154. The cubic root of 18641418 is about 265.1508243120.

The spelling of 18641418 in words is "eighteen million, six hundred forty-one thousand, four hundred eighteen".