3947189 has 2 divisors, whose sum is σ = 3947190. Its totient is φ = 3947188.

The previous prime is 3947173. The next prime is 3947227. The reversal of 3947189 is 9817493.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2146225 + 1800964 = 1465^2 + 1342^2 .

It is a cyclic number.

It is not a de Polignac number, because 3947189 - 2⁴ = 3947173 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3947089) 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, 1973594 + 1973595.

It is an arithmetic number, because the mean of its divisors is an integer number (1973595).

Almost surely, 2^3947189 is an apocalyptic number.

It is an amenable number.

3947189 is a deficient number, since it is larger than the sum of its proper divisors (1).

3947189 is an equidigital number, since it uses as much as digits as its factorization.

3947189 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 54432, while the sum is 41.

The square root of 3947189 is about 1986.7533817764. The cubic root of 3947189 is about 158.0384059817.

The spelling of 3947189 in words is "three million, nine hundred forty-seven thousand, one hundred eighty-nine".