138868838 has 4 divisors (see below), whose sum is σ = 208303260. Its totient is φ = 69434418.

The previous prime is 138868813. The next prime is 138868841. The reversal of 138868838 is 838868831.

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

It is a self number, because there is not a number n which added to its sum of digits gives 138868838.

It is a congruent number.

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 as a sum of consecutive naturals, namely, 34717208 + ... + 34717211.

It is an arithmetic number, because the mean of its divisors is an integer number (52075815).

Almost surely, 2^138868838 is an apocalyptic number.

138868838 is a deficient number, since it is larger than the sum of its proper divisors (69434422).

138868838 is an equidigital number, since it uses as much as digits as its factorization.

138868838 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69434421.

The product of its digits is 1769472, while the sum is 53.

The square root of 138868838 is about 11784.2623019008. The cubic root of 138868838 is about 517.8471620168.

The spelling of 138868838 in words is "one hundred thirty-eight million, eight hundred sixty-eight thousand, eight hundred thirty-eight".