18213838 has 8 divisors (see below), whose sum is σ = 28508688. Its totient is φ = 8710944.

The previous prime is 18213829. The next prime is 18213857. The reversal of 18213838 is 83831281.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 197931 + ... + 198022.

It is an arithmetic number, because the mean of its divisors is an integer number (3563586).

Almost surely, 2^18213838 is an apocalyptic number.

18213838 is a deficient number, since it is larger than the sum of its proper divisors (10294850).

18213838 is a wasteful number, since it uses less digits than its factorization.

18213838 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 395978.

The product of its digits is 9216, while the sum is 34.

The square root of 18213838 is about 4267.7673319899. The cubic root of 18213838 is about 263.1078605522.

The spelling of 18213838 in words is "eighteen million, two hundred thirteen thousand, eight hundred thirty-eight".