18813697 has 12 divisors (see below), whose sum is σ = 22007700. Its totient is φ = 16035936.

The previous prime is 18813689. The next prime is 18813731. The reversal of 18813697 is 79631881.

It can be written as a sum of positive squares in 2 ways, for example, as 17172736 + 1640961 = 4144^2 + 1281^2 .

It is not a de Polignac number, because 18813697 - 2³ = 18813689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18813607) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8679 + ... + 10627.

It is an arithmetic number, because the mean of its divisors is an integer number (1833975).

Almost surely, 2^18813697 is an apocalyptic number.

It is an amenable number.

18813697 is a deficient number, since it is larger than the sum of its proper divisors (3194003).

18813697 is a wasteful number, since it uses less digits than its factorization.

18813697 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2160 (or 2153 counting only the distinct ones).

The product of its digits is 72576, while the sum is 43.

The square root of 18813697 is about 4337.4758788955. The cubic root of 18813697 is about 265.9651385523.

The spelling of 18813697 in words is "eighteen million, eight hundred thirteen thousand, six hundred ninety-seven".