138993093 has 6 divisors (see below), whose sum is σ = 200767814. Its totient is φ = 92662056.

The previous prime is 138993077. The next prime is 138993103. The reversal of 138993093 is 390399831.

It can be written as a sum of positive squares in only one way, i.e., 127983969 + 11009124 = 11313^2 + 3318^2 .

It is not a de Polignac number, because 138993093 - 2⁴ = 138993077 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138993013) 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 5 ways as a sum of consecutive naturals, for example, 7721830 + ... + 7721847.

Almost surely, 2^138993093 is an apocalyptic number.

It is an amenable number.

138993093 is a deficient number, since it is larger than the sum of its proper divisors (61774721).

138993093 is a wasteful number, since it uses less digits than its factorization.

138993093 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15443683 (or 15443680 counting only the distinct ones).

The product of its (nonzero) digits is 157464, while the sum is 45.

The square root of 138993093 is about 11789.5331968658. The cubic root of 138993093 is about 518.0015665094.

The spelling of 138993093 in words is "one hundred thirty-eight million, nine hundred ninety-three thousand, ninety-three".