6439799 has 8 divisors (see below), whose sum is σ = 6621888. Its totient is φ = 6259680.

The previous prime is 6439777. The next prime is 6439819. The reversal of 6439799 is 9979346.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6439799 is a prime.

It is a super-2 number, since 2×6439799² = 82942022320802, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (47).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6439729) 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, 8129 + ... + 8885.

It is an arithmetic number, because the mean of its divisors is an integer number (827736).

Almost surely, 2^6439799 is an apocalyptic number.

6439799 is a deficient number, since it is larger than the sum of its proper divisors (182089).

6439799 is a wasteful number, since it uses less digits than its factorization.

6439799 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 985.

The product of its digits is 367416, while the sum is 47.

The square root of 6439799 is about 2537.6759052330. The cubic root of 6439799 is about 186.0476137402.

The spelling of 6439799 in words is "six million, four hundred thirty-nine thousand, seven hundred ninety-nine".