138789999 has 6 divisors (see below), whose sum is σ = 200474456. Its totient is φ = 92526660.

The previous prime is 138789991. The next prime is 138790037. The reversal of 138789999 is 999987831.

It is not a de Polignac number, because 138789999 - 2³ = 138789991 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138789991) 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, 7710547 + ... + 7710564.

Almost surely, 2^138789999 is an apocalyptic number.

138789999 is a deficient number, since it is larger than the sum of its proper divisors (61684457).

138789999 is a wasteful number, since it uses less digits than its factorization.

138789999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15421117 (or 15421114 counting only the distinct ones).

The product of its digits is 8817984, while the sum is 63.

The square root of 138789999 is about 11780.9167300342. The cubic root of 138789999 is about 517.7491455924.

The spelling of 138789999 in words is "one hundred thirty-eight million, seven hundred eighty-nine thousand, nine hundred ninety-nine".