18389138 has 32 divisors (see below), whose sum is σ = 30689280. Its totient is φ = 8225280.

The previous prime is 18389123. The next prime is 18389141. The reversal of 18389138 is 83198381.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 18389095 and 18389104.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 76823 + ... + 77061.

It is an arithmetic number, because the mean of its divisors is an integer number (959040).

Almost surely, 2^18389138 is an apocalyptic number.

18389138 is a deficient number, since it is larger than the sum of its proper divisors (12300142).

18389138 is a wasteful number, since it uses less digits than its factorization.

18389138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 362.

The product of its digits is 41472, while the sum is 41.

The square root of 18389138 is about 4288.2558225927. The cubic root of 18389138 is about 263.9492651970.

The spelling of 18389138 in words is "eighteen million, three hundred eighty-nine thousand, one hundred thirty-eight".