6448391 has 4 divisors (see below), whose sum is σ = 6787800. Its totient is φ = 6108984.

The previous prime is 6448381. The next prime is 6448399. The reversal of 6448391 is 1938446.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 6448391 - 2⁶ = 6448327 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6448399) 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, 169676 + ... + 169713.

It is an arithmetic number, because the mean of its divisors is an integer number (1696950).

Almost surely, 2^6448391 is an apocalyptic number.

6448391 is a deficient number, since it is larger than the sum of its proper divisors (339409).

6448391 is a wasteful number, since it uses less digits than its factorization.

6448391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 339408.

The product of its digits is 20736, while the sum is 35.

The square root of 6448391 is about 2539.3682285167. The cubic root of 6448391 is about 186.1303187390.

The spelling of 6448391 in words is "six million, four hundred forty-eight thousand, three hundred ninety-one".