138913838 has 32 divisors (see below), whose sum is σ = 241873344. Its totient is φ = 58609152.

The previous prime is 138913793. The next prime is 138913849. The reversal of 138913838 is 838319831.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 438056 + ... + 438372.

It is an arithmetic number, because the mean of its divisors is an integer number (7558542).

Almost surely, 2^138913838 is an apocalyptic number.

138913838 is a deficient number, since it is larger than the sum of its proper divisors (102959506).

138913838 is a wasteful number, since it uses less digits than its factorization.

138913838 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 716.

The product of its digits is 124416, while the sum is 44.

The square root of 138913838 is about 11786.1714733835. The cubic root of 138913838 is about 517.9030915447.

The spelling of 138913838 in words is "one hundred thirty-eight million, nine hundred thirteen thousand, eight hundred thirty-eight".