6438743 has 4 divisors (see below), whose sum is σ = 6450480. Its totient is φ = 6427008.

The previous prime is 6438721. The next prime is 6438749. The reversal of 6438743 is 3478346.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3478346 = 2 ⋅1739173.

It is a cyclic number.

It is not a de Polignac number, because 6438743 - 2¹⁰ = 6437719 is a prime.

It is a super-2 number, since 2×6438743² = 82914822840098, which contains 22 as substring.

It is a d-powerful number, because it can be written as 6⁵ + 4 + 3¹³ + 8⁵ + 7⁵ + 4⁶ + 3¹⁴ .

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6438749) 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, 5003 + ... + 6156.

It is an arithmetic number, because the mean of its divisors is an integer number (1612620).

Almost surely, 2^6438743 is an apocalyptic number.

6438743 is a deficient number, since it is larger than the sum of its proper divisors (11737).

6438743 is a wasteful number, since it uses less digits than its factorization.

6438743 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11736.

The product of its digits is 48384, while the sum is 35.

The square root of 6438743 is about 2537.4678323084. The cubic root of 6438743 is about 186.0374438048.

The spelling of 6438743 in words is "six million, four hundred thirty-eight thousand, seven hundred forty-three".