4421391 has 16 divisors (see below), whose sum is σ = 6439776. Its totient is φ = 2681856.

The previous prime is 4421371. The next prime is 4421407. The reversal of 4421391 is 1931244.

It is not a de Polignac number, because 4421391 - 2¹⁸ = 4159247 is a prime.

It is a nialpdrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4421321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2071 + ... + 3623.

It is an arithmetic number, because the mean of its divisors is an integer number (402486).

Almost surely, 2^4421391 is an apocalyptic number.

4421391 is a deficient number, since it is larger than the sum of its proper divisors (2018385).

4421391 is a wasteful number, since it uses less digits than its factorization.

4421391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1642.

The product of its digits is 864, while the sum is 24.

The square root of 4421391 is about 2102.7103937537. The cubic root of 4421391 is about 164.1293719411.

The spelling of 4421391 in words is "four million, four hundred twenty-one thousand, three hundred ninety-one".