18690906 has 32 divisors (see below), whose sum is σ = 41650560. Its totient is φ = 5552064.

The previous prime is 18690901. The next prime is 18690907. The reversal of 18690906 is 60909681.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is not an unprimeable number, because it can be changed into a prime (18690901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1870 + ... + 6393.

It is an arithmetic number, because the mean of its divisors is an integer number (1301580).

Almost surely, 2^18690906 is an apocalyptic number.

18690906 is an abundant number, since it is smaller than the sum of its proper divisors (22959654).

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

18690906 is a wasteful number, since it uses less digits than its factorization.

18690906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8310.

The product of its (nonzero) digits is 23328, while the sum is 39.

The square root of 18690906 is about 4323.2980466306. The cubic root of 18690906 is about 265.3852519268.

The spelling of 18690906 in words is "eighteen million, six hundred ninety thousand, nine hundred six".