138993556 has 24 divisors (see below), whose sum is σ = 264502784. Its totient is φ = 63525600.

The previous prime is 138993539. The next prime is 138993583. The reversal of 138993556 is 655399831.

It is a happy number.

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, 7620 + ... + 18331.

Almost surely, 2^138993556 is an apocalyptic number.

It is an amenable number.

138993556 is a deficient number, since it is larger than the sum of its proper divisors (125509228).

138993556 is a wasteful number, since it uses less digits than its factorization.

138993556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26071 (or 26069 counting only the distinct ones).

The product of its digits is 874800, while the sum is 49.

The square root of 138993556 is about 11789.5528329110. The cubic root of 138993556 is about 518.0021416805.

The spelling of 138993556 in words is "one hundred thirty-eight million, nine hundred ninety-three thousand, five hundred fifty-six".