18313897 has 6 divisors (see below), whose sum is σ = 21303978. Its totient is φ = 15697584.

The previous prime is 18313873. The next prime is 18313903. The reversal of 18313897 is 79831381.

It can be written as a sum of positive squares in only one way, i.e., 15202201 + 3111696 = 3899^2 + 1764^2 .

It is not a de Polignac number, because 18313897 - 2⁷ = 18313769 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18313837) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 186828 + ... + 186925.

It is an arithmetic number, because the mean of its divisors is an integer number (3550663).

Almost surely, 2^18313897 is an apocalyptic number.

It is an amenable number.

18313897 is a deficient number, since it is larger than the sum of its proper divisors (2990081).

18313897 is an equidigital number, since it uses as much as digits as its factorization.

18313897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 373767 (or 373760 counting only the distinct ones).

The product of its digits is 36288, while the sum is 40.

The square root of 18313897 is about 4279.4739162659. The cubic root of 18313897 is about 263.5887814786.

The spelling of 18313897 in words is "eighteen million, three hundred thirteen thousand, eight hundred ninety-seven".