6624399 has 8 divisors (see below), whose sum is σ = 8911152. Its totient is φ = 4376960.

The previous prime is 6624379. The next prime is 6624413. The reversal of 6624399 is 9934266.

It is a happy number.

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 6624399 - 2⁸ = 6624143 is a prime.

It is a super-3 number, since 3×6624399³ (a number of 21 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6624379) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9432 + ... + 10109.

It is an arithmetic number, because the mean of its divisors is an integer number (1113894).

Almost surely, 2^6624399 is an apocalyptic number.

6624399 is a deficient number, since it is larger than the sum of its proper divisors (2286753).

6624399 is a wasteful number, since it uses less digits than its factorization.

6624399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19657.

The product of its digits is 69984, while the sum is 39.

The square root of 6624399 is about 2573.7907840382. The cubic root of 6624399 is about 187.8086082242.

The spelling of 6624399 in words is "six million, six hundred twenty-four thousand, three hundred ninety-nine".