3643973 has 2 divisors, whose sum is σ = 3643974. Its totient is φ = 3643972.

The previous prime is 3643963. The next prime is 3644021. The reversal of 3643973 is 3793463.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2427364 + 1216609 = 1558^2 + 1103^2 .

It is an emirp because it is prime and its reverse (3793463) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3643973 - 2¹⁶ = 3578437 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3643963) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1821986 + 1821987.

It is an arithmetic number, because the mean of its divisors is an integer number (1821987).

Almost surely, 2^3643973 is an apocalyptic number.

It is an amenable number.

3643973 is a deficient number, since it is larger than the sum of its proper divisors (1).

3643973 is an equidigital number, since it uses as much as digits as its factorization.

3643973 is an evil number, because the sum of its binary digits is even.

The product of its digits is 40824, while the sum is 35.

The square root of 3643973 is about 1908.9193277873. The cubic root of 3643973 is about 153.8833799724.

The spelling of 3643973 in words is "three million, six hundred forty-three thousand, nine hundred seventy-three".