6443618 has 4 divisors (see below), whose sum is σ = 9665430. Its totient is φ = 3221808.

The previous prime is 6443579. The next prime is 6443621. The reversal of 6443618 is 8163446.

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

It can be written as a sum of positive squares in only one way, i.e., 6017209 + 426409 = 2453^2 + 653^2 .

It is a plaindrome in base 13.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1610903 + ... + 1610906.

Almost surely, 2^6443618 is an apocalyptic number.

6443618 is a deficient number, since it is larger than the sum of its proper divisors (3221812).

6443618 is a wasteful number, since it uses less digits than its factorization.

6443618 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3221811.

The product of its digits is 13824, while the sum is 32.

The square root of 6443618 is about 2538.4282538610. The cubic root of 6443618 is about 186.0843838025.

The spelling of 6443618 in words is "six million, four hundred forty-three thousand, six hundred eighteen".