6399506 has 4 divisors (see below), whose sum is σ = 9599262. Its totient is φ = 3199752.

The previous prime is 6399467. The next prime is 6399509. The reversal of 6399506 is 6059936.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 3389281 + 3010225 = 1841^2 + 1735^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 6399506.

It is not an unprimeable number, because it can be changed into a prime (6399509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1599875 + ... + 1599878.

Almost surely, 2^6399506 is an apocalyptic number.

6399506 is a deficient number, since it is larger than the sum of its proper divisors (3199756).

6399506 is a wasteful number, since it uses less digits than its factorization.

6399506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3199755.

The product of its (nonzero) digits is 43740, while the sum is 38.

The square root of 6399506 is about 2529.7244909278. The cubic root of 6399506 is about 185.6587762531.

The spelling of 6399506 in words is "six million, three hundred ninety-nine thousand, five hundred six".