18486851 has 4 divisors (see below), whose sum is σ = 18628104. Its totient is φ = 18345600.

The previous prime is 18486847. The next prime is 18486857. The reversal of 18486851 is 15868481.

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

It is a cyclic number.

It is not a de Polignac number, because 18486851 - 2² = 18486847 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18486799 and 18486808.

It is not an unprimeable number, because it can be changed into a prime (18486857) 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, 70430 + ... + 70691.

It is an arithmetic number, because the mean of its divisors is an integer number (4657026).

Almost surely, 2^18486851 is an apocalyptic number.

18486851 is a deficient number, since it is larger than the sum of its proper divisors (141253).

18486851 is a wasteful number, since it uses less digits than its factorization.

18486851 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141252.

The product of its digits is 61440, while the sum is 41.

The square root of 18486851 is about 4299.6338216178. The cubic root of 18486851 is about 264.4159487939.

The spelling of 18486851 in words is "eighteen million, four hundred eighty-six thousand, eight hundred fifty-one".