3967609 has 2 divisors, whose sum is σ = 3967610. Its totient is φ = 3967608.

The previous prime is 3967571. The next prime is 3967619. The reversal of 3967609 is 9067693.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3240000 + 727609 = 1800^2 + 853^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3967609 is a prime.

It is not a weakly prime, because it can be changed into another prime (3967619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1983804 + 1983805.

It is an arithmetic number, because the mean of its divisors is an integer number (1983805).

Almost surely, 2^3967609 is an apocalyptic number.

It is an amenable number.

3967609 is a deficient number, since it is larger than the sum of its proper divisors (1).

3967609 is an equidigital number, since it uses as much as digits as its factorization.

3967609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 61236, while the sum is 40.

The square root of 3967609 is about 1991.8857898986. The cubic root of 3967609 is about 158.3104641639.

The spelling of 3967609 in words is "three million, nine hundred sixty-seven thousand, six hundred nine".