6434391 has 16 divisors (see below), whose sum is σ = 9067520. Its totient is φ = 4052160.

The previous prime is 6434383. The next prime is 6434401. The reversal of 6434391 is 1934346.

It is not a de Polignac number, because 6434391 - 2³ = 6434383 is a prime.

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax 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 (6434321) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3195 + ... + 4803.

It is an arithmetic number, because the mean of its divisors is an integer number (566720).

Almost surely, 2^6434391 is an apocalyptic number.

6434391 is a deficient number, since it is larger than the sum of its proper divisors (2633129).

6434391 is a wasteful number, since it uses less digits than its factorization.

6434391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1686.

The product of its digits is 7776, while the sum is 30.

The square root of 6434391 is about 2536.6101395366. The cubic root of 6434391 is about 185.9955196053.

The spelling of 6434391 in words is "six million, four hundred thirty-four thousand, three hundred ninety-one".