138880705 has 4 divisors (see below), whose sum is σ = 166656852. Its totient is φ = 111104560.

The previous prime is 138880661. The next prime is 138880717. The reversal of 138880705 is 507088831.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 52316289 + 86564416 = 7233^2 + 9304^2 .

It is not a de Polignac number, because 138880705 - 2¹⁵ = 138847937 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13888066 + ... + 13888075.

It is an arithmetic number, because the mean of its divisors is an integer number (41664213).

Almost surely, 2^138880705 is an apocalyptic number.

It is an amenable number.

138880705 is a deficient number, since it is larger than the sum of its proper divisors (27776147).

138880705 is an equidigital number, since it uses as much as digits as its factorization.

138880705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27776146.

The product of its (nonzero) digits is 53760, while the sum is 40.

The square root of 138880705 is about 11784.7658016611. The cubic root of 138880705 is about 517.8619124276.

The spelling of 138880705 in words is "one hundred thirty-eight million, eight hundred eighty thousand, seven hundred five".