6406491 has 32 divisors (see below), whose sum is σ = 10866688. Its totient is φ = 3265920.

The previous prime is 6406483. The next prime is 6406493. The reversal of 6406491 is 1946046.

It is not a de Polignac number, because 6406491 - 2³ = 6406483 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6406493) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8085 + ... + 8841.

It is an arithmetic number, because the mean of its divisors is an integer number (339584).

Almost surely, 2^6406491 is an apocalyptic number.

6406491 is a deficient number, since it is larger than the sum of its proper divisors (4460197).

6406491 is a wasteful number, since it uses less digits than its factorization.

6406491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 811.

The product of its (nonzero) digits is 5184, while the sum is 30.

The square root of 6406491 is about 2531.1046995334. The cubic root of 6406491 is about 185.7262999554.

The spelling of 6406491 in words is "six million, four hundred six thousand, four hundred ninety-one".