6430406440 has 32 divisors (see below), whose sum is σ = 14498167680. Its totient is φ = 2566873152.

The previous prime is 6430406393. The next prime is 6430406449. The reversal of 6430406440 is 446040346.

It is not an unprimeable number, because it can be changed into a prime (6430406449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 145572 + ... + 184531.

It is an arithmetic number, because the mean of its divisors is an integer number (453067740).

Almost surely, 2^6430406440 is an apocalyptic number.

It is an amenable number.

6430406440 is an abundant number, since it is smaller than the sum of its proper divisors (8067761240).

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

6430406440 is a wasteful number, since it uses less digits than its factorization.

6430406440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 330601 (or 330597 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 31.

The square root of 6430406440 is about 80189.8150640092. The cubic root of 6430406440 is about 1859.5711849169.

Adding to 6430406440 its reverse (446040346), we get a palindrome (6876446786).

The spelling of 6430406440 in words is "six billion, four hundred thirty million, four hundred six thousand, four hundred forty".