6459440 has 40 divisors (see below), whose sum is σ = 16176048. Its totient is φ = 2384640.

The previous prime is 6459437. The next prime is 6459443. The reversal of 6459440 is 449546.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (6459437) and next prime (6459443).

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×6459440² = 83448730227200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 6459397 and 6459406.

It is not an unprimeable number, because it can be changed into a prime (6459443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2066 + ... + 4145.

Almost surely, 2^6459440 is an apocalyptic number.

It is an amenable number.

6459440 is an abundant number, since it is smaller than the sum of its proper divisors (9716608).

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

6459440 is a wasteful number, since it uses less digits than its factorization.

6459440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6237 (or 6231 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 32.

The square root of 6459440 is about 2541.5428385136. The cubic root of 6459440 is about 186.2365664530.

The spelling of 6459440 in words is "six million, four hundred fifty-nine thousand, four hundred forty".