6447389 has 4 divisors (see below), whose sum is σ = 6943356. Its totient is φ = 5951424.

The previous prime is 6447323. The next prime is 6447391. The reversal of 6447389 is 9837446.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2427364 + 4020025 = 1558^2 + 2005^2 .

It is a cyclic number.

It is not a de Polignac number, because 6447389 - 2¹² = 6443293 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6447989) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 247964 + ... + 247989.

It is an arithmetic number, because the mean of its divisors is an integer number (1735839).

Almost surely, 2^6447389 is an apocalyptic number.

It is an amenable number.

6447389 is a deficient number, since it is larger than the sum of its proper divisors (495967).

6447389 is a wasteful number, since it uses less digits than its factorization.

6447389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 495966.

The product of its digits is 145152, while the sum is 41.

The square root of 6447389 is about 2539.1709276849. The cubic root of 6447389 is about 186.1206774585.

The spelling of 6447389 in words is "six million, four hundred forty-seven thousand, three hundred eighty-nine".