138898717 has 2 divisors, whose sum is σ = 138898718. Its totient is φ = 138898716.

The previous prime is 138898681. The next prime is 138898741. The reversal of 138898717 is 717898831.

138898717 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 can be written as a sum of positive squares in only one way, i.e., 119661721 + 19236996 = 10939^2 + 4386^2 .

It is a cyclic number.

It is not a de Polignac number, because 138898717 - 2¹⁹ = 138374429 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138896717) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69449358 + 69449359.

It is an arithmetic number, because the mean of its divisors is an integer number (69449359).

Almost surely, 2^138898717 is an apocalyptic number.

It is an amenable number.

138898717 is a deficient number, since it is larger than the sum of its proper divisors (1).

138898717 is an equidigital number, since it uses as much as digits as its factorization.

138898717 is an evil number, because the sum of its binary digits is even.

The product of its digits is 677376, while the sum is 52.

The square root of 138898717 is about 11785.5299838404. The cubic root of 138898717 is about 517.8842993281.

The spelling of 138898717 in words is "one hundred thirty-eight million, eight hundred ninety-eight thousand, seven hundred seventeen".