18397427 has 4 divisors (see below), whose sum is σ = 18406176. Its totient is φ = 18388680.

The previous prime is 18397411. The next prime is 18397429. The reversal of 18397427 is 72479381.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 18397427 - 2⁴ = 18397411 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18397429) 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, 902 + ... + 6132.

It is an arithmetic number, because the mean of its divisors is an integer number (4601544).

Almost surely, 2^18397427 is an apocalyptic number.

18397427 is a deficient number, since it is larger than the sum of its proper divisors (8749).

18397427 is an equidigital number, since it uses as much as digits as its factorization.

18397427 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8748.

The product of its digits is 84672, while the sum is 41.

The square root of 18397427 is about 4289.2221905609. Note that the first 3 decimals coincide. The cubic root of 18397427 is about 263.9889180763.

The spelling of 18397427 in words is "eighteen million, three hundred ninety-seven thousand, four hundred twenty-seven".