4242391 has 2 divisors, whose sum is σ = 4242392. Its totient is φ = 4242390.

The previous prime is 4242353. The next prime is 4242397. The reversal of 4242391 is 1932424.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 4242391 - 2¹⁹ = 3718103 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4242397) 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 as a sum of consecutive naturals, namely, 2121195 + 2121196.

It is an arithmetic number, because the mean of its divisors is an integer number (2121196).

Almost surely, 2^4242391 is an apocalyptic number.

4242391 is a deficient number, since it is larger than the sum of its proper divisors (1).

4242391 is an equidigital number, since it uses as much as digits as its factorization.

4242391 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1728, while the sum is 25.

The square root of 4242391 is about 2059.7065324944. The cubic root of 4242391 is about 161.8838648415.

The spelling of 4242391 in words is "four million, two hundred forty-two thousand, three hundred ninety-one".