18213834 has 16 divisors (see below), whose sum is σ = 38570688. Its totient is φ = 5714112.

The previous prime is 18213829. The next prime is 18213857. The reversal of 18213834 is 43831281.

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, 89182 + ... + 89385.

It is an arithmetic number, because the mean of its divisors is an integer number (2410668).

Almost surely, 2^18213834 is an apocalyptic number.

18213834 is an abundant number, since it is smaller than the sum of its proper divisors (20356854).

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

18213834 is a wasteful number, since it uses less digits than its factorization.

18213834 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 178589.

The product of its digits is 4608, while the sum is 30.

The square root of 18213834 is about 4267.7668633607. The cubic root of 18213834 is about 263.1078412915.

The spelling of 18213834 in words is "eighteen million, two hundred thirteen thousand, eight hundred thirty-four".