18223806 has 16 divisors (see below), whose sum is σ = 36509184. Its totient is φ = 6064344.

The previous prime is 18223781. The next prime is 18223817. The reversal of 18223806 is 60832281.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1875 + ... + 6321.

It is an arithmetic number, because the mean of its divisors is an integer number (2281824).

Almost surely, 2^18223806 is an apocalyptic number.

18223806 is an abundant number, since it is smaller than the sum of its proper divisors (18285378).

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

18223806 is a wasteful number, since it uses less digits than its factorization.

18223806 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5135.

The product of its (nonzero) digits is 4608, while the sum is 30.

The square root of 18223806 is about 4268.9349959914. The cubic root of 18223806 is about 263.1558493553.

The spelling of 18223806 in words is "eighteen million, two hundred twenty-three thousand, eight hundred six".