6400400965 has 16 divisors (see below), whose sum is σ = 8822259072. Its totient is φ = 4366563264.

The previous prime is 6400400959. The next prime is 6400400977. The reversal of 6400400965 is 5690040046.

It is not a de Polignac number, because 6400400965 - 2¹⁷ = 6400269893 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 6400400965.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 457239 + ... + 471028.

It is an arithmetic number, because the mean of its divisors is an integer number (551391192).

Almost surely, 2^6400400965 is an apocalyptic number.

It is an amenable number.

6400400965 is a deficient number, since it is larger than the sum of its proper divisors (2421858107).

6400400965 is a wasteful number, since it uses less digits than its factorization.

6400400965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 928476.

The product of its (nonzero) digits is 25920, while the sum is 34.

The square root of 6400400965 is about 80002.5059920000. The cubic root of 6400400965 is about 1856.6743058576.

The spelling of 6400400965 in words is "six billion, four hundred million, four hundred thousand, nine hundred sixty-five".