4239491 has 2 divisors, whose sum is σ = 4239492. Its totient is φ = 4239490.

The previous prime is 4239479. The next prime is 4239493. The reversal of 4239491 is 1949324.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4239491 is a prime.

Together with 4239493, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (4239493) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2119745 + 2119746.

It is an arithmetic number, because the mean of its divisors is an integer number (2119746).

Almost surely, 2^4239491 is an apocalyptic number.

4239491 is a deficient number, since it is larger than the sum of its proper divisors (1).

4239491 is an equidigital number, since it uses as much as digits as its factorization.

4239491 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7776, while the sum is 32.

The square root of 4239491 is about 2059.0024283619. The cubic root of 4239491 is about 161.8469697494.

The spelling of 4239491 in words is "four million, two hundred thirty-nine thousand, four hundred ninety-one".