6399706 has 16 divisors (see below), whose sum is σ = 9836064. Its totient is φ = 3122064.

The previous prime is 6399689. The next prime is 6399707. The reversal of 6399706 is 6079936.

It is an Ulam number.

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 7 ways as a sum of consecutive naturals, for example, 21696 + ... + 21988.

It is an arithmetic number, because the mean of its divisors is an integer number (614754).

Almost surely, 2^6399706 is an apocalyptic number.

6399706 is a deficient number, since it is larger than the sum of its proper divisors (3436358).

6399706 is a wasteful number, since it uses less digits than its factorization.

6399706 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 525.

The product of its (nonzero) digits is 61236, while the sum is 40.

The square root of 6399706 is about 2529.7640206154. The cubic root of 6399706 is about 185.6607103278.

The spelling of 6399706 in words is "six million, three hundred ninety-nine thousand, seven hundred six".