18022856 has 32 divisors (see below), whose sum is σ = 36207000. Its totient is φ = 8380416.

The previous prime is 18022847. The next prime is 18022859. The reversal of 18022856 is 65822081.

It can be written as a sum of positive squares in 4 ways, for example, as 12888100 + 5134756 = 3590^2 + 2266^2 .

It is not an unprimeable number, because it can be changed into a prime (18022859) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11360 + ... + 12848.

Almost surely, 2^18022856 is an apocalyptic number.

It is an amenable number.

18022856 is an abundant number, since it is smaller than the sum of its proper divisors (18184144).

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

18022856 is a wasteful number, since it uses less digits than its factorization.

18022856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1601 (or 1597 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 32.

The square root of 18022856 is about 4245.3334380234. Note that the first 3 decimals coincide. The cubic root of 18022856 is about 262.1850178099.

The spelling of 18022856 in words is "eighteen million, twenty-two thousand, eight hundred fifty-six".