18231806 has 8 divisors (see below), whose sum is σ = 27733104. Its totient is φ = 8987440.

The previous prime is 18231799. The next prime is 18231821. The reversal of 18231806 is 60813281.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64055 + ... + 64338.

It is an arithmetic number, because the mean of its divisors is an integer number (3466638).

Almost surely, 2^18231806 is an apocalyptic number.

18231806 is a deficient number, since it is larger than the sum of its proper divisors (9501298).

18231806 is a wasteful number, since it uses less digits than its factorization.

18231806 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128466.

The product of its (nonzero) digits is 2304, while the sum is 29.

The square root of 18231806 is about 4269.8718950339. The cubic root of 18231806 is about 263.1943509872.

The spelling of 18231806 in words is "eighteen million, two hundred thirty-one thousand, eight hundred six".