138891277 has 8 divisors (see below), whose sum is σ = 160274816. Its totient is φ = 117893232.

The previous prime is 138891257. The next prime is 138891299. The reversal of 138891277 is 772198831.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 138891277 - 2¹¹ = 138889229 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138891257) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 95598 + ... + 97039.

It is an arithmetic number, because the mean of its divisors is an integer number (20034352).

Almost surely, 2^138891277 is an apocalyptic number.

It is an amenable number.

138891277 is a deficient number, since it is larger than the sum of its proper divisors (21383539).

138891277 is a wasteful number, since it uses less digits than its factorization.

138891277 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 192747.

The product of its digits is 169344, while the sum is 46.

The square root of 138891277 is about 11785.2143383139. The cubic root of 138891277 is about 517.8750524752.

It can be divided in two parts, 1388 and 91277, that added together give a triangular number (92665 = T₄₃₀).

The spelling of 138891277 in words is "one hundred thirty-eight million, eight hundred ninety-one thousand, two hundred seventy-seven".