18223856 has 20 divisors (see below), whose sum is σ = 40353072. Its totient is φ = 7810176.

The previous prime is 18223853. The next prime is 18223903. The reversal of 18223856 is 65832281.

It is a Smith number, since the sum of its digits (35) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18223853) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 81245 + ... + 81468.

Almost surely, 2^18223856 is an apocalyptic number.

18223856 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

18223856 is an abundant number, since it is smaller than the sum of its proper divisors (22129216).

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

18223856 is a wasteful number, since it uses less digits than its factorization.

18223856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 162728 (or 162722 counting only the distinct ones).

The product of its digits is 23040, while the sum is 35.

The square root of 18223856 is about 4268.9408522490. The cubic root of 18223856 is about 263.1560900255.

The spelling of 18223856 in words is "eighteen million, two hundred twenty-three thousand, eight hundred fifty-six".