18418290 has 32 divisors (see below), whose sum is σ = 48223296. Its totient is φ = 4464960.

The previous prime is 18418261. The next prime is 18418291. The reversal of 18418290 is 9281481.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (18418291) 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, 27577 + ... + 28236.

It is an arithmetic number, because the mean of its divisors is an integer number (1506978).

Almost surely, 2^18418290 is an apocalyptic number.

18418290 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18418290 is an abundant number, since it is smaller than the sum of its proper divisors (29805006).

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

18418290 is a wasteful number, since it uses less digits than its factorization.

18418290 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55834.

The product of its (nonzero) digits is 4608, while the sum is 33.

The square root of 18418290 is about 4291.6535274880. The cubic root of 18418290 is about 264.0886697101.

The spelling of 18418290 in words is "eighteen million, four hundred eighteen thousand, two hundred ninety".