6421743 has 12 divisors (see below), whose sum is σ = 9575488. Its totient is φ = 4142880.

The previous prime is 6421739. The next prime is 6421759. The reversal of 6421743 is 3471246.

6421743 is a `hidden beast` number, since 642 + 17 + 4 + 3 = 666.

It is not a de Polignac number, because 6421743 - 2² = 6421739 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6421703) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11230 + ... + 11787.

Almost surely, 2^6421743 is an apocalyptic number.

6421743 is a deficient number, since it is larger than the sum of its proper divisors (3153745).

6421743 is a wasteful number, since it uses less digits than its factorization.

6421743 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23054 (or 23051 counting only the distinct ones).

The product of its digits is 4032, while the sum is 27.

The square root of 6421743 is about 2534.1158221360. The cubic root of 6421743 is about 185.8735699950.

Adding to 6421743 its reverse (3471246), we get a palindrome (9892989).

The spelling of 6421743 in words is "six million, four hundred twenty-one thousand, seven hundred forty-three".