18339897 has 4 divisors (see below), whose sum is σ = 24453200. Its totient is φ = 12226596.

The previous prime is 18339857. The next prime is 18339899. The reversal of 18339897 is 79893381.

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 not a de Polignac number, because 18339897 - 2¹⁵ = 18307129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18339899) 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 3 ways as a sum of consecutive naturals, for example, 3056647 + ... + 3056652.

It is an arithmetic number, because the mean of its divisors is an integer number (6113300).

Almost surely, 2^18339897 is an apocalyptic number.

It is an amenable number.

18339897 is a deficient number, since it is larger than the sum of its proper divisors (6113303).

18339897 is an equidigital number, since it uses as much as digits as its factorization.

18339897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6113302.

The product of its digits is 326592, while the sum is 48.

The square root of 18339897 is about 4282.5105954335. The cubic root of 18339897 is about 263.7134603439.

The spelling of 18339897 in words is "eighteen million, three hundred thirty-nine thousand, eight hundred ninety-seven".