138883878 has 24 divisors (see below), whose sum is σ = 343903248. Its totient is φ = 39681072.

The previous prime is 138883873. The next prime is 138883879. The reversal of 138883878 is 878388831.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138883873) 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, 551001 + ... + 551252.

It is an arithmetic number, because the mean of its divisors is an integer number (14329302).

Almost surely, 2^138883878 is an apocalyptic number.

138883878 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

138883878 is an abundant number, since it is smaller than the sum of its proper divisors (205019370).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

138883878 is a wasteful number, since it uses less digits than its factorization.

138883878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1102268 (or 1102265 counting only the distinct ones).

The product of its digits is 2064384, while the sum is 54.

The square root of 138883878 is about 11784.9004238475. The cubic root of 138883878 is about 517.8658562520.

It can be divided in two parts, 13888 and 3878, that added together give a triangular number (17766 = T₁₈₈).

The spelling of 138883878 in words is "one hundred thirty-eight million, eight hundred eighty-three thousand, eight hundred seventy-eight".