4399891 has 4 divisors (see below), whose sum is σ = 4404400. Its totient is φ = 4395384.

The previous prime is 4399883. The next prime is 4399903. The reversal of 4399891 is 1989934.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 4399891 - 2³ = 4399883 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4319891) 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, 111 + ... + 2968.

It is an arithmetic number, because the mean of its divisors is an integer number (1101100).

Almost surely, 2^4399891 is an apocalyptic number.

4399891 is a deficient number, since it is larger than the sum of its proper divisors (4509).

4399891 is a wasteful number, since it uses less digits than its factorization.

4399891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4508.

The product of its digits is 69984, while the sum is 43.

The square root of 4399891 is about 2097.5917143238. The cubic root of 4399891 is about 163.8629009875.

Adding to 4399891 its sum of digits (43), we get a palindrome (4399934).

The spelling of 4399891 in words is "four million, three hundred ninety-nine thousand, eight hundred ninety-one".