4387891 has 2 divisors, whose sum is σ = 4387892. Its totient is φ = 4387890.

The previous prime is 4387847. The next prime is 4387907. The reversal of 4387891 is 1987834.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 4387891 - 2⁹ = 4387379 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (4387291) 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 as a sum of consecutive naturals, namely, 2193945 + 2193946.

It is an arithmetic number, because the mean of its divisors is an integer number (2193946).

Almost surely, 2^4387891 is an apocalyptic number.

4387891 is a deficient number, since it is larger than the sum of its proper divisors (1).

4387891 is an equidigital number, since it uses as much as digits as its factorization.

4387891 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 48384, while the sum is 40.

The square root of 4387891 is about 2094.7293381246. The cubic root of 4387891 is about 163.7137953873.

The spelling of 4387891 in words is "four million, three hundred eighty-seven thousand, eight hundred ninety-one".