138928910 has 16 divisors (see below), whose sum is σ = 256172112. Its totient is φ = 54216000.

The previous prime is 138928891. The next prime is 138928939. The reversal of 138928910 is 19829831.

It is a Harshad number since it is a multiple of its sum of digits (41).

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 in 7 ways as a sum of consecutive naturals, for example, 169016 + ... + 169835.

It is an arithmetic number, because the mean of its divisors is an integer number (16010757).

Almost surely, 2^138928910 is an apocalyptic number.

138928910 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

138928910 is a deficient number, since it is larger than the sum of its proper divisors (117243202).

138928910 is a wasteful number, since it uses less digits than its factorization.

138928910 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 338899.

The product of its (nonzero) digits is 31104, while the sum is 41.

The square root of 138928910 is about 11786.8108494198. The cubic root of 138928910 is about 517.9218215076.

The spelling of 138928910 in words is "one hundred thirty-eight million, nine hundred twenty-eight thousand, nine hundred ten".