3969389 has 2 divisors, whose sum is σ = 3969390. Its totient is φ = 3969388.

The previous prime is 3969377. The next prime is 3969391. The reversal of 3969389 is 9839693.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3771364 + 198025 = 1942^2 + 445^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3969389 is a prime.

Together with 3969391, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3969349) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1984694 + 1984695.

It is an arithmetic number, because the mean of its divisors is an integer number (1984695).

Almost surely, 2^3969389 is an apocalyptic number.

It is an amenable number.

3969389 is a deficient number, since it is larger than the sum of its proper divisors (1).

3969389 is an equidigital number, since it uses as much as digits as its factorization.

3969389 is an evil number, because the sum of its binary digits is even.

The product of its digits is 314928, while the sum is 47.

The square root of 3969389 is about 1992.3325525624. The cubic root of 3969389 is about 158.3341350529.

The spelling of 3969389 in words is "three million, nine hundred sixty-nine thousand, three hundred eighty-nine".