18890806 has 8 divisors (see below), whose sum is σ = 30912264. Its totient is φ = 8586720.

The previous prime is 18890801. The next prime is 18890813. The reversal of 18890806 is 60809881.

It is a happy number.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18890801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 429315 + ... + 429358.

It is an arithmetic number, because the mean of its divisors is an integer number (3864033).

Almost surely, 2^18890806 is an apocalyptic number.

18890806 is a deficient number, since it is larger than the sum of its proper divisors (12021458).

18890806 is a wasteful number, since it uses less digits than its factorization.

18890806 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 858686.

The product of its (nonzero) digits is 27648, while the sum is 40.

The square root of 18890806 is about 4346.3554847711. The cubic root of 18890806 is about 266.3280009807.

The spelling of 18890806 in words is "eighteen million, eight hundred ninety thousand, eight hundred six".