6406389 has 24 divisors (see below), whose sum is σ = 10182432. Its totient is φ = 3849120.

The previous prime is 6406381. The next prime is 6406427. The reversal of 6406389 is 9836046.

6406389 is a `hidden beast` number, since 640 + 6 + 3 + 8 + 9 = 666.

It is not a de Polignac number, because 6406389 - 2³ = 6406381 is a prime.

6406389 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6406381) 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 23 ways as a sum of consecutive naturals, for example, 15939 + ... + 16335.

It is an arithmetic number, because the mean of its divisors is an integer number (424268).

Almost surely, 2^6406389 is an apocalyptic number.

It is an amenable number.

6406389 is a deficient number, since it is larger than the sum of its proper divisors (3776043).

6406389 is a wasteful number, since it uses less digits than its factorization.

6406389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 577 (or 574 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 36.

The square root of 6406389 is about 2531.0845501484. The cubic root of 6406389 is about 185.7253142788.

The spelling of 6406389 in words is "six million, four hundred six thousand, three hundred eighty-nine".