18640344 has 32 divisors (see below), whose sum is σ = 46872000. Its totient is φ = 6177312.

The previous prime is 18640343. The next prime is 18640351. The reversal of 18640344 is 44304681.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18640343) 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 7 ways as a sum of consecutive naturals, for example, 2127 + ... + 6465.

It is an arithmetic number, because the mean of its divisors is an integer number (1464750).

Almost surely, 2^18640344 is an apocalyptic number.

It is an amenable number.

18640344 is an abundant number, since it is smaller than the sum of its proper divisors (28231656).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18640344 is a wasteful number, since it uses less digits than its factorization.

18640344 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4527 (or 4523 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 30.

The square root of 18640344 is about 4317.4464675315. The cubic root of 18640344 is about 265.1457321126.

The spelling of 18640344 in words is "eighteen million, six hundred forty thousand, three hundred forty-four".