138877 has 4 divisors (see below), whose sum is σ = 140220. Its totient is φ = 137536.

The previous prime is 138869. The next prime is 138883. The reversal of 138877 is 778831.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 70756 + 68121 = 266^2 + 261^2 .

It is a cyclic number.

It is not a de Polignac number, because 138877 - 2³ = 138869 is a prime.

It is a super-2 number, since 2×138877² = 38573642258, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138077) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 502 + ... + 727.

It is an arithmetic number, because the mean of its divisors is an integer number (35055).

2¹³⁸⁸⁷⁷ is an apocalyptic number.

It is an amenable number.

138877 is a deficient number, since it is larger than the sum of its proper divisors (1343).

138877 is a wasteful number, since it uses less digits than its factorization.

138877 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1342.

The product of its digits is 9408, while the sum is 34.

The square root of 138877 is about 372.6620452904. The cubic root of 138877 is about 51.7857307287.

The spelling of 138877 in words is "one hundred thirty-eight thousand, eight hundred seventy-seven".