138037849 has 2 divisors, whose sum is σ = 138037850. Its totient is φ = 138037848.

The previous prime is 138037799. The next prime is 138037859. The reversal of 138037849 is 948730831.

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., 135955600 + 2082249 = 11660^2 + 1443^2 .

It is an emirp because it is prime and its reverse (948730831) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 138037849 - 2²¹ = 135940697 is a prime.

It is not a weakly prime, because it can be changed into another prime (138037859) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69018924 + 69018925.

It is an arithmetic number, because the mean of its divisors is an integer number (69018925).

Almost surely, 2^138037849 is an apocalyptic number.

It is an amenable number.

138037849 is a deficient number, since it is larger than the sum of its proper divisors (1).

138037849 is an equidigital number, since it uses as much as digits as its factorization.

138037849 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 145152, while the sum is 43.

The square root of 138037849 is about 11748.9509744487. The cubic root of 138037849 is about 516.8121649653.

The spelling of 138037849 in words is "one hundred thirty-eight million, thirty-seven thousand, eight hundred forty-nine".