18856117 has 4 divisors (see below), whose sum is σ = 21549856. Its totient is φ = 16162380.

The previous prime is 18856087. The next prime is 18856129. The reversal of 18856117 is 71165881.

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 18856117 - 2⁷ = 18855989 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18856147) 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, 1346859 + ... + 1346872.

It is an arithmetic number, because the mean of its divisors is an integer number (5387464).

Almost surely, 2^18856117 is an apocalyptic number.

It is an amenable number.

18856117 is a deficient number, since it is larger than the sum of its proper divisors (2693739).

18856117 is an equidigital number, since it uses as much as digits as its factorization.

18856117 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2693738.

The product of its digits is 13440, while the sum is 37.

The square root of 18856117 is about 4342.3630663499. The cubic root of 18856117 is about 266.1648826053.

The spelling of 18856117 in words is "eighteen million, eight hundred fifty-six thousand, one hundred seventeen".