18329897 has 4 divisors (see below), whose sum is σ = 18921216. Its totient is φ = 17738580.

The previous prime is 18329881. The next prime is 18329903. The reversal of 18329897 is 79892381.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 18329897 - 2⁴ = 18329881 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18329807) 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, 295613 + ... + 295674.

It is an arithmetic number, because the mean of its divisors is an integer number (4730304).

Almost surely, 2^18329897 is an apocalyptic number.

It is an amenable number.

18329897 is a deficient number, since it is larger than the sum of its proper divisors (591319).

18329897 is an equidigital number, since it uses as much as digits as its factorization.

18329897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 591318.

The product of its digits is 217728, while the sum is 47.

The square root of 18329897 is about 4281.3428968024. The cubic root of 18329897 is about 263.6655208879.

The spelling of 18329897 in words is "eighteen million, three hundred twenty-nine thousand, eight hundred ninety-seven".