4138488649 has 2 divisors, whose sum is σ = 4138488650. Its totient is φ = 4138488648.

The previous prime is 4138488637. The next prime is 4138488659. The reversal of 4138488649 is 9468848314.

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., 3933798400 + 204690249 = 62720^2 + 14307^2 .

It is a cyclic number.

It is not a de Polignac number, because 4138488649 - 2⁷ = 4138488521 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 4138488649.

It is not a weakly prime, because it can be changed into another prime (4138488659) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2069244324 + 2069244325.

It is an arithmetic number, because the mean of its divisors is an integer number (2069244325).

Almost surely, 2^4138488649 is an apocalyptic number.

It is an amenable number.

4138488649 is a deficient number, since it is larger than the sum of its proper divisors (1).

4138488649 is an equidigital number, since it uses as much as digits as its factorization.

4138488649 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5308416, while the sum is 55.

The square root of 4138488649 is about 64331.0861792338. The cubic root of 4138488649 is about 1605.5133561651.

The spelling of 4138488649 in words is "four billion, one hundred thirty-eight million, four hundred eighty-eight thousand, six hundred forty-nine".