6399705 has 32 divisors (see below), whose sum is σ = 11337984. Its totient is φ = 3062016.

The previous prime is 6399689. The next prime is 6399707. The reversal of 6399705 is 5079936.

It is not a de Polignac number, because 6399705 - 2⁴ = 6399689 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a nialpdrome in base 15.

It is not an unprimeable number, because it can be changed into a prime (6399707) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6772 + ... + 7658.

It is an arithmetic number, because the mean of its divisors is an integer number (354312).

Almost surely, 2^6399705 is an apocalyptic number.

6399705 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

6399705 is a deficient number, since it is larger than the sum of its proper divisors (4938279).

6399705 is a wasteful number, since it uses less digits than its factorization.

6399705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 945.

The product of its (nonzero) digits is 51030, while the sum is 39.

The square root of 6399705 is about 2529.7638229685. The cubic root of 6399705 is about 185.6607006575.

The spelling of 6399705 in words is "six million, three hundred ninety-nine thousand, seven hundred five".