6399745 has 8 divisors (see below), whose sum is σ = 8377920. Its totient is φ = 4654320.

The previous prime is 6399739. The next prime is 6399761. The reversal of 6399745 is 5479936.

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

It is not a de Polignac number, because 6399745 - 2³ = 6399737 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 58125 + ... + 58234.

It is an arithmetic number, because the mean of its divisors is an integer number (1047240).

Almost surely, 2^6399745 is an apocalyptic number.

It is an amenable number.

6399745 is a deficient number, since it is larger than the sum of its proper divisors (1978175).

6399745 is a wasteful number, since it uses less digits than its factorization.

6399745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 116375.

The product of its digits is 204120, while the sum is 43.

The square root of 6399745 is about 2529.7717288325. The cubic root of 6399745 is about 185.6610874677.

The spelling of 6399745 in words is "six million, three hundred ninety-nine thousand, seven hundred forty-five".