6457891 has 18 divisors (see below), whose sum is σ = 7615580. Its totient is φ = 5456880.

The previous prime is 6457879. The next prime is 6457921. The reversal of 6457891 is 1987546.

It is not a de Polignac number, because 6457891 - 2⁵ = 6457859 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6457811) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 121821 + ... + 121873.

Almost surely, 2^6457891 is an apocalyptic number.

6457891 is a deficient number, since it is larger than the sum of its proper divisors (1157689).

6457891 is a wasteful number, since it uses less digits than its factorization.

6457891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 147 (or 83 counting only the distinct ones).

The product of its digits is 60480, while the sum is 40.

The square root of 6457891 is about 2541.2380840842. The cubic root of 6457891 is about 186.2216785007.

The spelling of 6457891 in words is "six million, four hundred fifty-seven thousand, eight hundred ninety-one".