18235818 has 24 divisors (see below), whose sum is σ = 39693888. Its totient is φ = 6050472.

The previous prime is 18235813. The next prime is 18235829. The reversal of 18235818 is 81853281.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (18235813) 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, 1855 + ... + 6317.

It is an arithmetic number, because the mean of its divisors is an integer number (1653912).

Almost surely, 2^18235818 is an apocalyptic number.

18235818 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

18235818 is an abundant number, since it is smaller than the sum of its proper divisors (21458070).

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

18235818 is a wasteful number, since it uses less digits than its factorization.

18235818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4698 (or 4695 counting only the distinct ones).

The product of its digits is 15360, while the sum is 36.

The square root of 18235818 is about 4270.3416725129. The cubic root of 18235818 is about 263.2136553153.

The spelling of 18235818 in words is "eighteen million, two hundred thirty-five thousand, eight hundred eighteen".