138277887 has 64 divisors (see below), whose sum is σ = 221184000. Its totient is φ = 76003200.

The previous prime is 138277873. The next prime is 138277897. The reversal of 138277887 is 788772831.

It is not a de Polignac number, because 138277887 - 2⁶ = 138277823 is a prime.

It is a super-3 number, since 3×138277887³ (a number of 25 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138277897) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1750314 + ... + 1750392.

It is an arithmetic number, because the mean of its divisors is an integer number (3456000).

Almost surely, 2^138277887 is an apocalyptic number.

138277887 is a deficient number, since it is larger than the sum of its proper divisors (82906113).

138277887 is a wasteful number, since it uses less digits than its factorization.

138277887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 212.

The product of its digits is 1053696, while the sum is 51.

The square root of 138277887 is about 11759.1618323756. The cubic root of 138277887 is about 517.1115580216. Note that the first 3 decimals are identical.

The spelling of 138277887 in words is "one hundred thirty-eight million, two hundred seventy-seven thousand, eight hundred eighty-seven".