138922693 has 18 divisors (see below), whose sum is σ = 174408486. Its totient is φ = 109681488.

The previous prime is 138922643. The next prime is 138922697. The reversal of 138922693 is 396229831.

It can be written as a sum of positive squares in only one way, i.e., 96177249 + 42745444 = 9807^2 + 6538^2 .

It is a de Polignac number, because none of the positive numbers 2^k-138922693 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138922697) by changing a digit.

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 17 ways as a sum of consecutive naturals, for example, 297246 + ... + 297712.

Almost surely, 2^138922693 is an apocalyptic number.

138922693 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

138922693 is a deficient number, since it is larger than the sum of its proper divisors (35485793).

138922693 is an frugal number, since it uses more digits than its factorization.

138922693 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 961 (or 487 counting only the distinct ones).

The product of its digits is 139968, while the sum is 43.

The square root of 138922693 is about 11786.5471194918. The cubic root of 138922693 is about 517.9140958106.

The spelling of 138922693 in words is "one hundred thirty-eight million, nine hundred twenty-two thousand, six hundred ninety-three".