6399747 has 12 divisors (see below), whose sum is σ = 9284184. Its totient is φ = 4248000.

The previous prime is 6399739. The next prime is 6399761. The reversal of 6399747 is 7479936.

6399747 is a `hidden beast` number, since 639 + 9 + 7 + 4 + 7 = 666.

It is not a de Polignac number, because 6399747 - 2³ = 6399739 is a prime.

It is an Ulam number.

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 11 ways as a sum of consecutive naturals, for example, 843 + ... + 3675.

It is an arithmetic number, because the mean of its divisors is an integer number (773682).

Almost surely, 2^6399747 is an apocalyptic number.

6399747 is a deficient number, since it is larger than the sum of its proper divisors (2884437).

6399747 is a wasteful number, since it uses less digits than its factorization.

6399747 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3090 (or 3087 counting only the distinct ones).

The product of its digits is 285768, while the sum is 45.

The square root of 6399747 is about 2529.7721241250. The cubic root of 6399747 is about 185.6611068082.

The spelling of 6399747 in words is "six million, three hundred ninety-nine thousand, seven hundred forty-seven".