4078649 has 2 divisors, whose sum is σ = 4078650. Its totient is φ = 4078648.

The previous prime is 4078637. The next prime is 4078651. The reversal of 4078649 is 9468704.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2229049 + 1849600 = 1493^2 + 1360^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4078649 is a prime.

It is a Sophie Germain prime.

Together with 4078651, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (4078609) 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, 2039324 + 2039325.

It is an arithmetic number, because the mean of its divisors is an integer number (2039325).

Almost surely, 2^4078649 is an apocalyptic number.

It is an amenable number.

4078649 is a deficient number, since it is larger than the sum of its proper divisors (1).

4078649 is an equidigital number, since it uses as much as digits as its factorization.

4078649 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48384, while the sum is 38.

The square root of 4078649 is about 2019.5665376511. The cubic root of 4078649 is about 159.7737557563.

The spelling of 4078649 in words is "four million, seventy-eight thousand, six hundred forty-nine".