6443245 has 4 divisors (see below), whose sum is σ = 7731900. Its totient is φ = 5154592.

The previous prime is 6443231. The next prime is 6443287. The reversal of 6443245 is 5423446.

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 4748041 + 1695204 = 2179^2 + 1302^2 .

It is a cyclic number.

It is not a de Polignac number, because 6443245 - 2⁷ = 6443117 is a prime.

It is a super-2 number, since 2×6443245² = 83030812260050, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 644320 + ... + 644329.

It is an arithmetic number, because the mean of its divisors is an integer number (1932975).

Almost surely, 2^6443245 is an apocalyptic number.

It is an amenable number.

6443245 is a deficient number, since it is larger than the sum of its proper divisors (1288655).

6443245 is a wasteful number, since it uses less digits than its factorization.

6443245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1288654.

The product of its digits is 11520, while the sum is 28.

The square root of 6443245 is about 2538.3547821374. The cubic root of 6443245 is about 186.0807931274.

The spelling of 6443245 in words is "six million, four hundred forty-three thousand, two hundred forty-five".