138773889 has 12 divisors (see below), whose sum is σ = 205340772. Its totient is φ = 90259200.

The previous prime is 138773879. The next prime is 138773893. The reversal of 138773889 is 988377831.

It can be written as a sum of positive squares in 2 ways, for example, as 43125489 + 95648400 = 6567^2 + 9780^2 .

It is not a de Polignac number, because 138773889 - 2⁹ = 138773377 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (138773879) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 187672 + ... + 188409.

It is an arithmetic number, because the mean of its divisors is an integer number (17111731).

Almost surely, 2^138773889 is an apocalyptic number.

It is an amenable number.

138773889 is a deficient number, since it is larger than the sum of its proper divisors (66566883).

138773889 is a wasteful number, since it uses less digits than its factorization.

138773889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 376128 (or 376125 counting only the distinct ones).

The product of its digits is 2032128, while the sum is 54.

The square root of 138773889 is about 11780.2329773226. The cubic root of 138773889 is about 517.7291123010.

It can be divided in two parts, 13877 and 3889, that added together give a triangular number (17766 = T₁₈₈).

The spelling of 138773889 in words is "one hundred thirty-eight million, seven hundred seventy-three thousand, eight hundred eighty-nine".