6399946 has 8 divisors (see below), whose sum is σ = 10971360. Its totient is φ = 2742828.

The previous prime is 6399931. The next prime is 6399947. The reversal of 6399946 is 6499936.

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

It is a nialpdrome in base 15.

It is a junction number, because it is equal to n+sod(n) for n = 6399896 and 6399905.

It is not an unprimeable number, because it can be changed into a prime (6399947) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 228556 + ... + 228583.

It is an arithmetic number, because the mean of its divisors is an integer number (1371420).

Almost surely, 2^6399946 is an apocalyptic number.

6399946 is a deficient number, since it is larger than the sum of its proper divisors (4571414).

6399946 is a wasteful number, since it uses less digits than its factorization.

6399946 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 457148.

The product of its digits is 314928, while the sum is 46.

The square root of 6399946 is about 2529.8114554251. The cubic root of 6399946 is about 185.6630311643.

It can be divided in two parts, 639994 and 6, that added together give a square (640000 = 800²).

The spelling of 6399946 in words is "six million, three hundred ninety-nine thousand, nine hundred forty-six".