3647989 has 2 divisors, whose sum is σ = 3647990. Its totient is φ = 3647988.

The previous prime is 3647971. The next prime is 3648031. The reversal of 3647989 is 9897463.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3392964 + 255025 = 1842^2 + 505^2 .

It is a cyclic number.

It is not a de Polignac number, because 3647989 - 2⁹ = 3647477 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3647489) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1823994 + 1823995.

It is an arithmetic number, because the mean of its divisors is an integer number (1823995).

Almost surely, 2^3647989 is an apocalyptic number.

It is an amenable number.

3647989 is a deficient number, since it is larger than the sum of its proper divisors (1).

3647989 is an equidigital number, since it uses as much as digits as its factorization.

3647989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 326592, while the sum is 46.

The square root of 3647989 is about 1909.9709421873. The cubic root of 3647989 is about 153.9398905232.

The spelling of 3647989 in words is "three million, six hundred forty-seven thousand, nine hundred eighty-nine".