4391663 has 4 divisors (see below), whose sum is σ = 4414848. Its totient is φ = 4368480.

The previous prime is 4391659. The next prime is 4391671. The reversal of 4391663 is 3661934.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3661934 = 2 ⋅1830967.

It is a cyclic number.

It is not a de Polignac number, because 4391663 - 2² = 4391659 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 (4391683) 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 3 ways as a sum of consecutive naturals, for example, 11306 + ... + 11687.

It is an arithmetic number, because the mean of its divisors is an integer number (1103712).

Almost surely, 2^4391663 is an apocalyptic number.

4391663 is a deficient number, since it is larger than the sum of its proper divisors (23185).

4391663 is a wasteful number, since it uses less digits than its factorization.

4391663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23184.

The product of its digits is 11664, while the sum is 32.

The square root of 4391663 is about 2095.6294996969. The cubic root of 4391663 is about 163.7606935114.

The spelling of 4391663 in words is "four million, three hundred ninety-one thousand, six hundred sixty-three".