18326857 has 4 divisors (see below), whose sum is σ = 18389700. Its totient is φ = 18264016.

The previous prime is 18326839. The next prime is 18326873. The reversal of 18326857 is 75862381.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 17943696 + 383161 = 4236^2 + 619^2 .

It is a cyclic number.

It is not a de Polignac number, because 18326857 - 2²³ = 9938249 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18326807) 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, 30982 + ... + 31567.

It is an arithmetic number, because the mean of its divisors is an integer number (4597425).

Almost surely, 2^18326857 is an apocalyptic number.

It is an amenable number.

18326857 is a deficient number, since it is larger than the sum of its proper divisors (62843).

18326857 is an equidigital number, since it uses as much as digits as its factorization.

18326857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62842.

The product of its digits is 80640, while the sum is 40.

The square root of 18326857 is about 4280.9878532881. The cubic root of 18326857 is about 263.6509438375.

The spelling of 18326857 in words is "eighteen million, three hundred twenty-six thousand, eight hundred fifty-seven".