3989429 has 2 divisors, whose sum is σ = 3989430. Its totient is φ = 3989428.

The previous prime is 3989413. The next prime is 3989431. The reversal of 3989429 is 9249893.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3900625 + 88804 = 1975^2 + 298^2 .

It is an emirp because it is prime and its reverse (9249893) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3989429 - 2⁴ = 3989413 is a prime.

Together with 3989431, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 3989429.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3989329) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1994714 + 1994715.

It is an arithmetic number, because the mean of its divisors is an integer number (1994715).

Almost surely, 2^3989429 is an apocalyptic number.

It is an amenable number.

3989429 is a deficient number, since it is larger than the sum of its proper divisors (1).

3989429 is an equidigital number, since it uses as much as digits as its factorization.

3989429 is an evil number, because the sum of its binary digits is even.

The product of its digits is 139968, while the sum is 44.

The square root of 3989429 is about 1997.3555016571. The cubic root of 3989429 is about 158.6001450267.

The spelling of 3989429 in words is "three million, nine hundred eighty-nine thousand, four hundred twenty-nine".