4006649 has 2 divisors, whose sum is σ = 4006650. Its totient is φ = 4006648.

The previous prime is 4006637. The next prime is 4006661. The reversal of 4006649 is 9466004.

It is a balanced prime because it is at equal distance from previous prime (4006637) and next prime (4006661).

It can be written as a sum of positive squares in only one way, i.e., 3763600 + 243049 = 1940^2 + 493^2 .

It is a cyclic number.

It is not a de Polignac number, because 4006649 - 2⁴ = 4006633 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (4006699) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2003324 + 2003325.

It is an arithmetic number, because the mean of its divisors is an integer number (2003325).

Almost surely, 2^4006649 is an apocalyptic number.

It is an amenable number.

4006649 is a deficient number, since it is larger than the sum of its proper divisors (1).

4006649 is an equidigital number, since it uses as much as digits as its factorization.

4006649 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5184, while the sum is 29.

The square root of 4006649 is about 2001.6615598048. The cubic root of 4006649 is about 158.8280117539.

The spelling of 4006649 in words is "four million, six thousand, six hundred forty-nine".