18026857 has 4 divisors (see below), whose sum is σ = 18035856. Its totient is φ = 18017860.

The previous prime is 18026831. The next prime is 18026863. The reversal of 18026857 is 75862081.

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 a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 75862081 = 2347 ⋅32323.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18026857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18026887) 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, 18 + ... + 6004.

It is an arithmetic number, because the mean of its divisors is an integer number (4508964).

Almost surely, 2^18026857 is an apocalyptic number.

It is an amenable number.

18026857 is a deficient number, since it is larger than the sum of its proper divisors (8999).

18026857 is an equidigital number, since it uses as much as digits as its factorization.

18026857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8998.

The product of its (nonzero) digits is 26880, while the sum is 37.

The square root of 18026857 is about 4245.8046351663. The cubic root of 18026857 is about 262.2044177068.

The spelling of 18026857 in words is "eighteen million, twenty-six thousand, eight hundred fifty-seven".