138277873 has 2 divisors, whose sum is σ = 138277874. Its totient is φ = 138277872.

The previous prime is 138277861. The next prime is 138277897. The reversal of 138277873 is 378772831.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 90003169 + 48274704 = 9487^2 + 6948^2 .

It is a cyclic number.

It is not a de Polignac number, because 138277873 - 2²⁵ = 104723441 is a prime.

It is a super-2 number, since 2×138277873² = 38241540322808258, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (138277823) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69138936 + 69138937.

It is an arithmetic number, because the mean of its divisors is an integer number (69138937).

Almost surely, 2^138277873 is an apocalyptic number.

It is an amenable number.

138277873 is a deficient number, since it is larger than the sum of its proper divisors (1).

138277873 is an equidigital number, since it uses as much as digits as its factorization.

138277873 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 395136, while the sum is 46.

The square root of 138277873 is about 11759.1612370951. The cubic root of 138277873 is about 517.1115405699. Note that the first 3 decimals are identical.

The spelling of 138277873 in words is "one hundred thirty-eight million, two hundred seventy-seven thousand, eight hundred seventy-three".