6401679 has 8 divisors (see below), whose sum is σ = 8614320. Its totient is φ = 4228416.

The previous prime is 6401669. The next prime is 6401687. The reversal of 6401679 is 9761046.

It is a happy number.

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

It is not a de Polignac number, because 6401679 - 2²¹ = 4304527 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6401609) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9462 + ... + 10115.

It is an arithmetic number, because the mean of its divisors is an integer number (1076790).

Almost surely, 2^6401679 is an apocalyptic number.

6401679 is a deficient number, since it is larger than the sum of its proper divisors (2212641).

6401679 is a wasteful number, since it uses less digits than its factorization.

6401679 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19689.

The product of its (nonzero) digits is 9072, while the sum is 33.

The square root of 6401679 is about 2530.1539478854. The cubic root of 6401679 is about 185.6797878159.

The spelling of 6401679 in words is "six million, four hundred one thousand, six hundred seventy-nine".