138890317 has 2 divisors, whose sum is σ = 138890318. Its totient is φ = 138890316.

The previous prime is 138890299. The next prime is 138890333. The reversal of 138890317 is 713098831.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 133957476 + 4932841 = 11574^2 + 2221^2 .

It is a cyclic number.

It is not a de Polignac number, because 138890317 - 2¹⁵ = 138857549 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 138890317.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138890347) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69445158 + 69445159.

It is an arithmetic number, because the mean of its divisors is an integer number (69445159).

Almost surely, 2^138890317 is an apocalyptic number.

It is an amenable number.

138890317 is a deficient number, since it is larger than the sum of its proper divisors (1).

138890317 is an equidigital number, since it uses as much as digits as its factorization.

138890317 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36288, while the sum is 40.

The square root of 138890317 is about 11785.1736092431. The cubic root of 138890317 is about 517.8738593089.

The spelling of 138890317 in words is "one hundred thirty-eight million, eight hundred ninety thousand, three hundred seventeen".