18320697 has 6 divisors (see below), whose sum is σ = 26463242. Its totient is φ = 12213792.

The previous prime is 18320677. The next prime is 18320723. The reversal of 18320697 is 79602381.

It can be written as a sum of positive squares in only one way, i.e., 17438976 + 881721 = 4176^2 + 939^2 .

It is not a de Polignac number, because 18320697 - 2⁶ = 18320633 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18320677) 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, 1017808 + ... + 1017825.

Almost surely, 2^18320697 is an apocalyptic number.

It is an amenable number.

18320697 is a deficient number, since it is larger than the sum of its proper divisors (8142545).

18320697 is a wasteful number, since it uses less digits than its factorization.

18320697 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2035639 (or 2035636 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 36.

The square root of 18320697 is about 4280.2683327100. The cubic root of 18320697 is about 263.6214011867.

The spelling of 18320697 in words is "eighteen million, three hundred twenty thousand, six hundred ninety-seven".