18644313 has 8 divisors (see below), whose sum is σ = 25049376. Its totient is φ = 12334400.

The previous prime is 18644281. The next prime is 18644317. The reversal of 18644313 is 31344681.

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

It is a cyclic number.

It is not a de Polignac number, because 18644313 - 2⁵ = 18644281 is a prime.

It is a super-2 number, since 2×18644313² = 695220814483938, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18644317) 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, 23328 + ... + 24113.

It is an arithmetic number, because the mean of its divisors is an integer number (3131172).

Almost surely, 2^18644313 is an apocalyptic number.

It is an amenable number.

18644313 is a deficient number, since it is larger than the sum of its proper divisors (6405063).

18644313 is a wasteful number, since it uses less digits than its factorization.

18644313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47575.

The product of its digits is 6912, while the sum is 30.

The square root of 18644313 is about 4317.9060897616. The cubic root of 18644313 is about 265.1645495179.

Adding to 18644313 its reverse (31344681), we get a palindrome (49988994).

The spelling of 18644313 in words is "eighteen million, six hundred forty-four thousand, three hundred thirteen".