6421428439 has 4 divisors (see below), whose sum is σ = 6558054624. Its totient is φ = 6284802256.

The previous prime is 6421428407. The next prime is 6421428449. The reversal of 6421428439 is 9348241246.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9348241246 = 2 ⋅4674120623.

It is a cyclic number.

It is not a de Polignac number, because 6421428439 - 2⁵ = 6421428407 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 6421428395 and 6421428404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6421428449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 68313022 + ... + 68313115.

It is an arithmetic number, because the mean of its divisors is an integer number (1639513656).

Almost surely, 2^6421428439 is an apocalyptic number.

6421428439 is a deficient number, since it is larger than the sum of its proper divisors (136626185).

6421428439 is a wasteful number, since it uses less digits than its factorization.

6421428439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136626184.

The product of its digits is 331776, while the sum is 43.

The square root of 6421428439 is about 80133.8158270277. The cubic root of 6421428439 is about 1858.7053501783.

The spelling of 6421428439 in words is "six billion, four hundred twenty-one million, four hundred twenty-eight thousand, four hundred thirty-nine".