18856697 has 4 divisors (see below), whose sum is σ = 19068660. Its totient is φ = 18644736.

The previous prime is 18856693. The next prime is 18856709. The reversal of 18856697 is 79665881.

It is a happy number.

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 10118761 + 8737936 = 3181^2 + 2956^2 .

It is a cyclic number.

It is not a de Polignac number, because 18856697 - 2² = 18856693 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18856693) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 105848 + ... + 106025.

It is an arithmetic number, because the mean of its divisors is an integer number (4767165).

Almost surely, 2^18856697 is an apocalyptic number.

It is an amenable number.

18856697 is a deficient number, since it is larger than the sum of its proper divisors (211963).

18856697 is an equidigital number, since it uses as much as digits as its factorization.

18856697 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 211962.

The product of its digits is 725760, while the sum is 50.

The square root of 18856697 is about 4342.4298497500. The cubic root of 18856697 is about 266.1676115880.

The spelling of 18856697 in words is "eighteen million, eight hundred fifty-six thousand, six hundred ninety-seven".