6351440 has 20 divisors (see below), whose sum is σ = 14767284. Its totient is φ = 2540544.

The previous prime is 6351431. The next prime is 6351461. The reversal of 6351440 is 441536.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 3225616 + 3125824 = 1796^2 + 1768^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39617 + ... + 39776.

Almost surely, 2^6351440 is an apocalyptic number.

It is an amenable number.

6351440 is an abundant number, since it is smaller than the sum of its proper divisors (8415844).

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

6351440 is a wasteful number, since it uses less digits than its factorization.

6351440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79406 (or 79400 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 6351440 is about 2520.2063407586. The cubic root of 6351440 is about 185.1927866114.

Adding to 6351440 its reverse (441536), we get a palindrome (6792976).

The spelling of 6351440 in words is "six million, three hundred fifty-one thousand, four hundred forty".