3657649 has 2 divisors, whose sum is σ = 3657650. Its totient is φ = 3657648.

The previous prime is 3657637. The next prime is 3657653. The reversal of 3657649 is 9467563.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2458624 + 1199025 = 1568^2 + 1095^2 .

It is a cyclic number.

It is not a de Polignac number, because 3657649 - 2⁵ = 3657617 is a prime.

It is not a weakly prime, because it can be changed into another prime (3657679) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1828824 + 1828825.

It is an arithmetic number, because the mean of its divisors is an integer number (1828825).

Almost surely, 2^3657649 is an apocalyptic number.

It is an amenable number.

3657649 is a deficient number, since it is larger than the sum of its proper divisors (1).

3657649 is an equidigital number, since it uses as much as digits as its factorization.

3657649 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 136080, while the sum is 40.

The square root of 3657649 is about 1912.4981045742. The cubic root of 3657649 is about 154.0756501317.

The spelling of 3657649 in words is "three million, six hundred fifty-seven thousand, six hundred forty-nine".