6421959 has 12 divisors (see below), whose sum is σ = 9389016. Its totient is φ = 4229232.

The previous prime is 6421931. The next prime is 6421967. The reversal of 6421959 is 9591246.

6421959 is a `hidden beast` number, since 642 + 1 + 9 + 5 + 9 = 666.

It is not a de Polignac number, because 6421959 - 2⁸ = 6421703 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6421159) 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, 3552 + ... + 5045.

It is an arithmetic number, because the mean of its divisors is an integer number (782418).

Almost surely, 2^6421959 is an apocalyptic number.

6421959 is a deficient number, since it is larger than the sum of its proper divisors (2967057).

6421959 is a wasteful number, since it uses less digits than its factorization.

6421959 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8686 (or 8683 counting only the distinct ones).

The product of its digits is 19440, while the sum is 36.

The square root of 6421959 is about 2534.1584401927. The cubic root of 6421959 is about 185.8756539693.

It can be divided in two parts, 642 and 1959, that added together give a square (2601 = 51²).

The spelling of 6421959 in words is "six million, four hundred twenty-one thousand, nine hundred fifty-nine".