3688649 has 2 divisors, whose sum is σ = 3688650. Its totient is φ = 3688648.

The previous prime is 3688637. The next prime is 3688661. The reversal of 3688649 is 9468863.

It is a balanced prime because it is at equal distance from previous prime (3688637) and next prime (3688661).

It can be written as a sum of positive squares in only one way, i.e., 3553225 + 135424 = 1885^2 + 368^2 .

It is an emirp because it is prime and its reverse (9468863) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3688649 - 2⁸ = 3688393 is a prime.

It is a super-2 number, since 2×3688649² = 27212262890402, which contains 22 as substring.

It is a Chen prime.

It is a plaindrome in base 15.

It is not a weakly prime, because it can be changed into another prime (3688549) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1844324 + 1844325.

It is an arithmetic number, because the mean of its divisors is an integer number (1844325).

Almost surely, 2^3688649 is an apocalyptic number.

It is an amenable number.

3688649 is a deficient number, since it is larger than the sum of its proper divisors (1).

3688649 is an equidigital number, since it uses as much as digits as its factorization.

3688649 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 248832, while the sum is 44.

The square root of 3688649 is about 1920.5855877831. The cubic root of 3688649 is about 154.5097098732.

The spelling of 3688649 in words is "three million, six hundred eighty-eight thousand, six hundred forty-nine".