6456440 has 16 divisors (see below), whose sum is σ = 14527080. Its totient is φ = 2582560.

The previous prime is 6456427. The next prime is 6456449. The reversal of 6456440 is 446546.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6456449) 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, 80666 + ... + 80745.

Almost surely, 2^6456440 is an apocalyptic number.

It is an amenable number.

6456440 is an abundant number, since it is smaller than the sum of its proper divisors (8070640).

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

6456440 is a wasteful number, since it uses less digits than its factorization.

6456440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161422 (or 161418 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 29.

The square root of 6456440 is about 2540.9525772828. The cubic root of 6456440 is about 186.2077302992.

The spelling of 6456440 in words is "six million, four hundred fifty-six thousand, four hundred forty".