18022857 has 4 divisors (see below), whose sum is σ = 24030480. Its totient is φ = 12015236.

The previous prime is 18022847. The next prime is 18022859. The reversal of 18022857 is 75822081.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 75822081 = 3 ⋅25274027.

It is a cyclic number.

It is not a de Polignac number, because 18022857 - 2⁶ = 18022793 is a prime.

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 3 ways as a sum of consecutive naturals, for example, 3003807 + ... + 3003812.

It is an arithmetic number, because the mean of its divisors is an integer number (6007620).

Almost surely, 2^18022857 is an apocalyptic number.

It is an amenable number.

18022857 is a deficient number, since it is larger than the sum of its proper divisors (6007623).

18022857 is an equidigital number, since it uses as much as digits as its factorization.

18022857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6007622.

The product of its (nonzero) digits is 8960, while the sum is 33.

The square root of 18022857 is about 4245.3335557998. Note that the first 3 decimals coincide. The cubic root of 18022857 is about 262.1850226591.

The spelling of 18022857 in words is "eighteen million, twenty-two thousand, eight hundred fifty-seven".