18397646 has 4 divisors (see below), whose sum is σ = 27596472. Its totient is φ = 9198822.

The previous prime is 18397637. The next prime is 18397649. The reversal of 18397646 is 64679381.

It is a semiprime because it is the product of two primes.

It is a junction number, because it is equal to n+sod(n) for n = 18397597 and 18397606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18397649) 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 as a sum of consecutive naturals, namely, 4599410 + ... + 4599413.

It is an arithmetic number, because the mean of its divisors is an integer number (6899118).

Almost surely, 2^18397646 is an apocalyptic number.

18397646 is a deficient number, since it is larger than the sum of its proper divisors (9198826).

18397646 is an equidigital number, since it uses as much as digits as its factorization.

18397646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9198825.

The product of its digits is 217728, while the sum is 44.

The square root of 18397646 is about 4289.2477195891. The cubic root of 18397646 is about 263.9899655660.

The spelling of 18397646 in words is "eighteen million, three hundred ninety-seven thousand, six hundred forty-six".