4438891 has 2 divisors, whose sum is σ = 4438892. Its totient is φ = 4438890.

The previous prime is 4438871. The next prime is 4438901. The reversal of 4438891 is 1988344.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4438891 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 4438891.

It is not a weakly prime, because it can be changed into another prime (4438831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2219445 + 2219446.

It is an arithmetic number, because the mean of its divisors is an integer number (2219446).

Almost surely, 2^4438891 is an apocalyptic number.

4438891 is the 1333-rd centered pentagonal number.

4438891 is a deficient number, since it is larger than the sum of its proper divisors (1).

4438891 is an equidigital number, since it uses as much as digits as its factorization.

4438891 is an evil number, because the sum of its binary digits is even.

The product of its digits is 27648, while the sum is 37.

The square root of 4438891 is about 2106.8675800819. The cubic root of 4438891 is about 164.3456298877.

It can be divided in two parts, 4438 and 891, that added together give a square (5329 = 73²).

The spelling of 4438891 in words is "four million, four hundred thirty-eight thousand, eight hundred ninety-one".