6447399 has 8 divisors (see below), whose sum is σ = 9824640. Its totient is φ = 3684216.

The previous prime is 6447391. The next prime is 6447407. The reversal of 6447399 is 9937446.

It is an interprime number because it is at equal distance from previous prime (6447391) and next prime (6447407).

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

It is not a de Polignac number, because 6447399 - 2³ = 6447391 is a prime.

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 6447399.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6447391) 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, 153489 + ... + 153530.

It is an arithmetic number, because the mean of its divisors is an integer number (1228080).

Almost surely, 2^6447399 is an apocalyptic number.

6447399 is a deficient number, since it is larger than the sum of its proper divisors (3377241).

6447399 is a wasteful number, since it uses less digits than its factorization.

6447399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 307029.

The product of its digits is 163296, while the sum is 42.

The square root of 6447399 is about 2539.1728968308. The cubic root of 6447399 is about 186.1207736838.

The spelling of 6447399 in words is "six million, four hundred forty-seven thousand, three hundred ninety-nine".