6406239 has 16 divisors (see below), whose sum is σ = 9808128. Its totient is φ = 3643392.

The previous prime is 6406219. The next prime is 6406247. The reversal of 6406239 is 9326046.

It is not a de Polignac number, because 6406239 - 2⁷ = 6406111 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6406219) 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 15 ways as a sum of consecutive naturals, for example, 4804 + ... + 5990.

It is an arithmetic number, because the mean of its divisors is an integer number (613008).

Almost surely, 2^6406239 is an apocalyptic number.

6406239 is a deficient number, since it is larger than the sum of its proper divisors (3401889).

6406239 is a wasteful number, since it uses less digits than its factorization.

6406239 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1454.

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

The square root of 6406239 is about 2531.0549184085. The cubic root of 6406239 is about 185.7238647356.

The spelling of 6406239 in words is "six million, four hundred six thousand, two hundred thirty-nine".