18083857 has 4 divisors (see below), whose sum is σ = 19727856. Its totient is φ = 16439860.

The previous prime is 18083851. The next prime is 18083873. The reversal of 18083857 is 75838081.

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.

It is a cyclic number.

It is not a de Polignac number, because 18083857 - 2²³ = 9695249 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 (18083851) 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, 821983 + ... + 822004.

It is an arithmetic number, because the mean of its divisors is an integer number (4931964).

Almost surely, 2^18083857 is an apocalyptic number.

It is an amenable number.

18083857 is a deficient number, since it is larger than the sum of its proper divisors (1643999).

18083857 is a wasteful number, since it uses less digits than its factorization.

18083857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1643998.

The product of its (nonzero) digits is 53760, while the sum is 40.

The square root of 18083857 is about 4252.5118459565. The cubic root of 18083857 is about 262.4804859265.

It can be divided in two parts, 1808 and 3857, that added together give a palindrome (5665).

The spelling of 18083857 in words is "eighteen million, eighty-three thousand, eight hundred fifty-seven".