6399401 has 8 divisors (see below), whose sum is σ = 6669000. Its totient is φ = 6133120.

The previous prime is 6399397. The next prime is 6399427. The reversal of 6399401 is 1049936.

It can be written as a sum of positive squares in 4 ways, for example, as 144400 + 6255001 = 380^2 + 2501^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 6399401 - 2² = 6399397 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6390401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3581 + ... + 5061.

It is an arithmetic number, because the mean of its divisors is an integer number (833625).

Almost surely, 2^6399401 is an apocalyptic number.

It is an amenable number.

6399401 is a deficient number, since it is larger than the sum of its proper divisors (269599).

6399401 is a wasteful number, since it uses less digits than its factorization.

6399401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1659.

The product of its (nonzero) digits is 5832, while the sum is 32.

The square root of 6399401 is about 2529.7037375946. The cubic root of 6399401 is about 185.6577608477.

The spelling of 6399401 in words is "six million, three hundred ninety-nine thousand, four hundred one".