6428391 has 8 divisors (see below), whose sum is σ = 8603904. Its totient is φ = 4269240.

The previous prime is 6428369. The next prime is 6428393. The reversal of 6428391 is 1938246.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 6428391 - 2⁷ = 6428263 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6428393) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3141 + ... + 4766.

It is an arithmetic number, because the mean of its divisors is an integer number (1075488).

Almost surely, 2^6428391 is an apocalyptic number.

6428391 is a deficient number, since it is larger than the sum of its proper divisors (2175513).

6428391 is a wasteful number, since it uses less digits than its factorization.

6428391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8181.

The product of its digits is 10368, while the sum is 33.

The square root of 6428391 is about 2535.4271829418. The cubic root of 6428391 is about 185.9376886894.

The spelling of 6428391 in words is "six million, four hundred twenty-eight thousand, three hundred ninety-one".