138684914 has 16 divisors (see below), whose sum is σ = 219451680. Its totient is φ = 65550240.

The previous prime is 138684911. The next prime is 138684937. The reversal of 138684914 is 419486831.

It is not an unprimeable number, because it can be changed into a prime (138684911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14942 + ... + 22374.

It is an arithmetic number, because the mean of its divisors is an integer number (13715730).

Almost surely, 2^138684914 is an apocalyptic number.

138684914 is a deficient number, since it is larger than the sum of its proper divisors (80766766).

138684914 is a wasteful number, since it uses less digits than its factorization.

138684914 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7945.

The product of its digits is 165888, while the sum is 44.

The square root of 138684914 is about 11776.4559184841. The cubic root of 138684914 is about 517.6184411546.

The spelling of 138684914 in words is "one hundred thirty-eight million, six hundred eighty-four thousand, nine hundred fourteen".