6400400969 has 4 divisors (see below), whose sum is σ = 6678679296. Its totient is φ = 6122122644.

The previous prime is 6400400959. The next prime is 6400400977. The reversal of 6400400969 is 9690040046.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 6400400969 - 2⁴ = 6400400953 is a prime.

It is a super-2 number, since 2×6400400969² = 81930265127952277922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6400400959) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 139139129 + ... + 139139174.

It is an arithmetic number, because the mean of its divisors is an integer number (1669669824).

Almost surely, 2^6400400969 is an apocalyptic number.

It is an amenable number.

6400400969 is a deficient number, since it is larger than the sum of its proper divisors (278278327).

6400400969 is a wasteful number, since it uses less digits than its factorization.

6400400969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 278278326.

The product of its (nonzero) digits is 46656, while the sum is 38.

The square root of 6400400969 is about 80002.5060169992. The cubic root of 6400400969 is about 1856.6743062444.

The spelling of 6400400969 in words is "six billion, four hundred million, four hundred thousand, nine hundred sixty-nine".