18397641 has 8 divisors (see below), whose sum is σ = 24558784. Its totient is φ = 12250800.

The previous prime is 18397637. The next prime is 18397649. The reversal of 18397641 is 14679381.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 18397641 - 2² = 18397637 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18397641.

It is not an unprimeable number, because it can be changed into a prime (18397649) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 85 + ... + 6066.

It is an arithmetic number, because the mean of its divisors is an integer number (3069848).

Almost surely, 2^18397641 is an apocalyptic number.

It is an amenable number.

18397641 is a deficient number, since it is larger than the sum of its proper divisors (6161143).

18397641 is an equidigital number, since it uses as much as digits as its factorization.

18397641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7151.

The product of its digits is 36288, while the sum is 39.

The square root of 18397641 is about 4289.2471367362. The cubic root of 18397641 is about 263.9899416508.

The spelling of 18397641 in words is "eighteen million, three hundred ninety-seven thousand, six hundred forty-one".