18338613 has 16 divisors (see below), whose sum is σ = 25938816. Its totient is φ = 11499840.

The previous prime is 18338609. The next prime is 18338651. The reversal of 18338613 is 31683381.

It is a happy number.

It is not a de Polignac number, because 18338613 - 2² = 18338609 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18338653) 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, 2031 + ... + 6387.

It is an arithmetic number, because the mean of its divisors is an integer number (1621176).

Almost surely, 2^18338613 is an apocalyptic number.

It is an amenable number.

18338613 is a deficient number, since it is larger than the sum of its proper divisors (7600203).

18338613 is a wasteful number, since it uses less digits than its factorization.

18338613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4444.

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

The square root of 18338613 is about 4282.3606807461. The cubic root of 18338613 is about 263.7073058930.

The spelling of 18338613 in words is "eighteen million, three hundred thirty-eight thousand, six hundred thirteen".