4138649 has 2 divisors, whose sum is σ = 4138650. Its totient is φ = 4138648.

The previous prime is 4138627. The next prime is 4138681. The reversal of 4138649 is 9468314.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2088025 + 2050624 = 1445^2 + 1432^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4138649 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (4138609) 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, 2069324 + 2069325.

It is an arithmetic number, because the mean of its divisors is an integer number (2069325).

Almost surely, 2^4138649 is an apocalyptic number.

It is an amenable number.

4138649 is a deficient number, since it is larger than the sum of its proper divisors (1).

4138649 is an equidigital number, since it uses as much as digits as its factorization.

4138649 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20736, while the sum is 35.

The square root of 4138649 is about 2034.3669777108. The cubic root of 4138649 is about 160.5534091782.

The spelling of 4138649 in words is "four million, one hundred thirty-eight thousand, six hundred forty-nine".