138637783 has 2 divisors, whose sum is σ = 138637784. Its totient is φ = 138637782.

The previous prime is 138637739. The next prime is 138637789. The reversal of 138637783 is 387736831.

138637783 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-138637783 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138637789) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69318891 + 69318892.

It is an arithmetic number, because the mean of its divisors is an integer number (69318892).

Almost surely, 2^138637783 is an apocalyptic number.

138637783 is a deficient number, since it is larger than the sum of its proper divisors (1).

138637783 is an equidigital number, since it uses as much as digits as its factorization.

138637783 is an evil number, because the sum of its binary digits is even.

The product of its digits is 508032, while the sum is 46.

The square root of 138637783 is about 11774.4546795170. The cubic root of 138637783 is about 517.5597982973.

The spelling of 138637783 in words is "one hundred thirty-eight million, six hundred thirty-seven thousand, seven hundred eighty-three".