3645997 has 2 divisors, whose sum is σ = 3645998. Its totient is φ = 3645996.

The previous prime is 3645979. The next prime is 3646001. The reversal of 3645997 is 7995463.

Together with previous prime (3645979) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2996361 + 649636 = 1731^2 + 806^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3645997 is a prime.

It is a d-powerful number, because it can be written as 3⁸ + 6⁸ + 4 + 5⁹ + 9² + 9⁴ + 7² .

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3645977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1822998 + 1822999.

It is an arithmetic number, because the mean of its divisors is an integer number (1822999).

Almost surely, 2^3645997 is an apocalyptic number.

It is an amenable number.

3645997 is a deficient number, since it is larger than the sum of its proper divisors (1).

3645997 is an equidigital number, since it uses as much as digits as its factorization.

3645997 is an evil number, because the sum of its binary digits is even.

The product of its digits is 204120, while the sum is 43.

The square root of 3645997 is about 1909.4493970776. The cubic root of 3645997 is about 153.9118655762.

The spelling of 3645997 in words is "three million, six hundred forty-five thousand, nine hundred ninety-seven".