138873834 has 24 divisors (see below), whose sum is σ = 328247712. Its totient is φ = 42082920.

The previous prime is 138873829. The next prime is 138873841. The reversal of 138873834 is 438378831.

It is a self number, because there is not a number n which added to its sum of digits gives 138873834.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 350494 + ... + 350889.

It is an arithmetic number, because the mean of its divisors is an integer number (13676988).

Almost surely, 2^138873834 is an apocalyptic number.

138873834 is an abundant number, since it is smaller than the sum of its proper divisors (189373878).

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

138873834 is a wasteful number, since it uses less digits than its factorization.

138873834 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 701402 (or 701399 counting only the distinct ones).

The product of its digits is 387072, while the sum is 45.

The square root of 138873834 is about 11784.4742776248. The cubic root of 138873834 is about 517.8533720335.

The spelling of 138873834 in words is "one hundred thirty-eight million, eight hundred seventy-three thousand, eight hundred thirty-four".