138748273 has 2 divisors, whose sum is σ = 138748274. Its totient is φ = 138748272.

The previous prime is 138748243. The next prime is 138748283. The reversal of 138748273 is 372847831.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 107578384 + 31169889 = 10372^2 + 5583^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-138748273 is a prime.

It is not a weakly prime, because it can be changed into another prime (138748243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69374136 + 69374137.

It is an arithmetic number, because the mean of its divisors is an integer number (69374137).

Almost surely, 2^138748273 is an apocalyptic number.

It is an amenable number.

138748273 is a deficient number, since it is larger than the sum of its proper divisors (1).

138748273 is an equidigital number, since it uses as much as digits as its factorization.

138748273 is an evil number, because the sum of its binary digits is even.

The product of its digits is 225792, while the sum is 43.

The square root of 138748273 is about 11779.1456820943. The cubic root of 138748273 is about 517.6972548069.

The spelling of 138748273 in words is "one hundred thirty-eight million, seven hundred forty-eight thousand, two hundred seventy-three".