6399456 has 96 divisors (see below), whose sum is σ = 19595520. Its totient is φ = 1790976.

The previous prime is 6399433. The next prime is 6399457. The reversal of 6399456 is 6549936.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (42).

Its product of digits (174960) is a multiple of the sum of its prime factors (216).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6399457) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 59755 + ... + 59861.

It is an arithmetic number, because the mean of its divisors is an integer number (204120).

Almost surely, 2^6399456 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6399456, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9797760).

6399456 is an abundant number, since it is smaller than the sum of its proper divisors (13196064).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6399456 is a wasteful number, since it uses less digits than its factorization.

6399456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 216 (or 208 counting only the distinct ones).

The product of its digits is 174960, while the sum is 42.

The square root of 6399456 is about 2529.7146084094. The cubic root of 6399456 is about 185.6582927281.

The spelling of 6399456 in words is "six million, three hundred ninety-nine thousand, four hundred fifty-six".