138841784 has 16 divisors (see below), whose sum is σ = 261468600. Its totient is φ = 69116832.

The previous prime is 138841783. The next prime is 138841793. The reversal of 138841784 is 487148831.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138841783) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36062 + ... + 39725.

Almost surely, 2^138841784 is an apocalyptic number.

It is an amenable number.

138841784 is a deficient number, since it is larger than the sum of its proper divisors (122626816).

138841784 is a wasteful number, since it uses less digits than its factorization.

138841784 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76022 (or 76018 counting only the distinct ones).

The product of its digits is 172032, while the sum is 44.

The square root of 138841784 is about 11783.1143591158. The cubic root of 138841784 is about 517.8135313689.

The spelling of 138841784 in words is "one hundred thirty-eight million, eight hundred forty-one thousand, seven hundred eighty-four".