18905906 has 8 divisors (see below), whose sum is σ = 28700784. Its totient is φ = 9338980.

The previous prime is 18905869. The next prime is 18905923. The reversal of 18905906 is 60950981.

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

It is a self number, because there is not a number n which added to its sum of digits gives 18905906.

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 3 ways as a sum of consecutive naturals, for example, 56780 + ... + 57111.

It is an arithmetic number, because the mean of its divisors is an integer number (3587598).

Almost surely, 2^18905906 is an apocalyptic number.

18905906 is a deficient number, since it is larger than the sum of its proper divisors (9794878).

18905906 is a wasteful number, since it uses less digits than its factorization.

18905906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 113976.

The product of its (nonzero) digits is 19440, while the sum is 38.

The square root of 18905906 is about 4348.0922253329. The cubic root of 18905906 is about 266.3989434588.

The spelling of 18905906 in words is "eighteen million, nine hundred five thousand, nine hundred six".