6400959 has 8 divisors (see below), whose sum is σ = 9036720. Its totient is φ = 4016256.

The previous prime is 6400957. The next prime is 6400981. The reversal of 6400959 is 9590046.

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 6400959 - 2¹ = 6400957 is a prime.

It is a super-2 number, since 2×6400959² = 81944552239362, which contains 22 as substring.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6400951) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 62704 + ... + 62805.

It is an arithmetic number, because the mean of its divisors is an integer number (1129590).

Almost surely, 2^6400959 is an apocalyptic number.

6400959 is a deficient number, since it is larger than the sum of its proper divisors (2635761).

6400959 is a wasteful number, since it uses less digits than its factorization.

6400959 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125529.

The product of its (nonzero) digits is 9720, while the sum is 33.

The square root of 6400959 is about 2530.0116600522. The cubic root of 6400959 is about 185.6728263890.

The spelling of 6400959 in words is "six million, four hundred thousand, nine hundred fifty-nine".