6438722 has 16 divisors (see below), whose sum is σ = 9965592. Its totient is φ = 3118080.

The previous prime is 6438721. The next prime is 6438749. The reversal of 6438722 is 2278346.

It can be written as a sum of positive squares in 4 ways, for example, as 2157961 + 4280761 = 1469^2 + 2069^2 .

It is a d-powerful number, because it can be written as 6⁷ + 4⁹ + 3⁶ + 8 + 7⁸ + 2⁵ + 2¹⁷ .

It is not an unprimeable number, because it can be changed into a prime (6438721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18938 + ... + 19274.

Almost surely, 2^6438722 is an apocalyptic number.

6438722 is a deficient number, since it is larger than the sum of its proper divisors (3526870).

6438722 is a wasteful number, since it uses less digits than its factorization.

6438722 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 613.

The product of its digits is 16128, while the sum is 32.

The square root of 6438722 is about 2537.4636943216. The cubic root of 6438722 is about 186.0372415505.

The spelling of 6438722 in words is "six million, four hundred thirty-eight thousand, seven hundred twenty-two".