4242989 has 2 divisors, whose sum is σ = 4242990. Its totient is φ = 4242988.

The previous prime is 4242983. The next prime is 4242991. The reversal of 4242989 is 9892424.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2778889 + 1464100 = 1667^2 + 1210^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4242989 is a prime.

It is a Sophie Germain prime.

Together with 4242991, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4242983) 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, 2121494 + 2121495.

It is an arithmetic number, because the mean of its divisors is an integer number (2121495).

Almost surely, 2^4242989 is an apocalyptic number.

It is an amenable number.

4242989 is a deficient number, since it is larger than the sum of its proper divisors (1).

4242989 is an equidigital number, since it uses as much as digits as its factorization.

4242989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 41472, while the sum is 38.

The square root of 4242989 is about 2059.8516936906. The cubic root of 4242989 is about 161.8914707728.

The spelling of 4242989 in words is "four million, two hundred forty-two thousand, nine hundred eighty-nine".