18243906 has 16 divisors (see below), whose sum is σ = 36547200. Its totient is φ = 6071408.

The previous prime is 18243881. The next prime is 18243913. The reversal of 18243906 is 60934281.

It is a super-2 number, since 2×18243906² = 665680212273672, which contains 22 as substring.

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, 2200 + ... + 6428.

It is an arithmetic number, because the mean of its divisors is an integer number (2284200).

Almost surely, 2^18243906 is an apocalyptic number.

18243906 is an abundant number, since it is smaller than the sum of its proper divisors (18303294).

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

18243906 is a wasteful number, since it uses less digits than its factorization.

18243906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4953.

The product of its (nonzero) digits is 10368, while the sum is 33.

The square root of 18243906 is about 4271.2885643562. The cubic root of 18243906 is about 263.2525633110.

The spelling of 18243906 in words is "eighteen million, two hundred forty-three thousand, nine hundred six".