138888877 has 4 divisors (see below), whose sum is σ = 139741120. Its totient is φ = 138036636.

The previous prime is 138888857. The next prime is 138888907. The reversal of 138888877 is 778888831.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-138888877 is a prime.

It is a super-2 number, since 2×138888877² = 38580240308642258, 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 (138888847) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 425877 + ... + 426202.

It is an arithmetic number, because the mean of its divisors is an integer number (34935280).

Almost surely, 2^138888877 is an apocalyptic number.

It is an amenable number.

138888877 is a deficient number, since it is larger than the sum of its proper divisors (852243).

138888877 is an equidigital number, since it uses as much as digits as its factorization.

138888877 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 852242.

The product of its digits is 4816896, while the sum is 58.

The square root of 138888877 is about 11785.1125153729. The cubic root of 138888877 is about 517.8720695490.

The spelling of 138888877 in words is "one hundred thirty-eight million, eight hundred eighty-eight thousand, eight hundred seventy-seven".