138888234 has 24 divisors (see below), whose sum is σ = 301298400. Its totient is φ = 46238568.

The previous prime is 138888227. The next prime is 138888257. The reversal of 138888234 is 432888831.

It is a self number, because there is not a number n which added to its sum of digits gives 138888234.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11617 + ... + 20315.

It is an arithmetic number, because the mean of its divisors is an integer number (12554100).

Almost surely, 2^138888234 is an apocalyptic number.

138888234 is an abundant number, since it is smaller than the sum of its proper divisors (162410166).

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

138888234 is a wasteful number, since it uses less digits than its factorization.

138888234 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9594 (or 9591 counting only the distinct ones).

The product of its digits is 294912, while the sum is 45.

The square root of 138888234 is about 11785.0852351606. The cubic root of 138888234 is about 517.8712703675.

It can be divided in two parts, 13888 and 8234, that added together give a palindrome (22122).

The spelling of 138888234 in words is "one hundred thirty-eight million, eight hundred eighty-eight thousand, two hundred thirty-four".