4239649 has 2 divisors, whose sum is σ = 4239650. Its totient is φ = 4239648.

The previous prime is 4239611. The next prime is 4239667. The reversal of 4239649 is 9469324.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4028049 + 211600 = 2007^2 + 460^2 .

It is a cyclic number.

It is not a de Polignac number, because 4239649 - 2¹¹ = 4237601 is a prime.

4239649 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (4239149) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2119824 + 2119825.

It is an arithmetic number, because the mean of its divisors is an integer number (2119825).

Almost surely, 2^4239649 is an apocalyptic number.

It is an amenable number.

4239649 is a deficient number, since it is larger than the sum of its proper divisors (1).

4239649 is an equidigital number, since it uses as much as digits as its factorization.

4239649 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 46656, while the sum is 37.

The square root of 4239649 is about 2059.0407960990. The cubic root of 4239649 is about 161.8489803291.

The spelling of 4239649 in words is "four million, two hundred thirty-nine thousand, six hundred forty-nine".