6400456 has 8 divisors (see below), whose sum is σ = 12000870. Its totient is φ = 3200224.

The previous prime is 6400453. The next prime is 6400489. The reversal of 6400456 is 6540046.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 5924356 + 476100 = 2434^2 + 690^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a self number, because there is not a number n which added to its sum of digits gives 6400456.

It is not an unprimeable number, because it can be changed into a prime (6400451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 400021 + ... + 400036.

Almost surely, 2^6400456 is an apocalyptic number.

It is an amenable number.

6400456 is a deficient number, since it is larger than the sum of its proper divisors (5600414).

6400456 is a wasteful number, since it uses less digits than its factorization.

6400456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 800063 (or 800059 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 25.

The square root of 6400456 is about 2529.9122514427. The cubic root of 6400456 is about 185.6679627492.

The spelling of 6400456 in words is "six million, four hundred thousand, four hundred fifty-six".