18389706 has 16 divisors (see below), whose sum is σ = 37001664. Its totient is φ = 6092864.

The previous prime is 18389687. The next prime is 18389713. The reversal of 18389706 is 60798381.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8175 + ... + 10178.

It is an arithmetic number, because the mean of its divisors is an integer number (2312604).

Almost surely, 2^18389706 is an apocalyptic number.

18389706 is an abundant number, since it is smaller than the sum of its proper divisors (18611958).

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

18389706 is a wasteful number, since it uses less digits than its factorization.

18389706 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18525.

The product of its (nonzero) digits is 72576, while the sum is 42.

The square root of 18389706 is about 4288.3220494734. The cubic root of 18389706 is about 263.9519827730.

The spelling of 18389706 in words is "eighteen million, three hundred eighty-nine thousand, seven hundred six".