138798009 has 16 divisors (see below), whose sum is σ = 235002240. Its totient is φ = 79313040.

The previous prime is 138798007. The next prime is 138798019. The reversal of 138798009 is 900897831.

138798009 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 138798009 - 2¹ = 138798007 is a prime.

It is not an unprimeable number, because it can be changed into a prime (138798007) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 367002 + ... + 367379.

It is an arithmetic number, because the mean of its divisors is an integer number (14687640).

Almost surely, 2^138798009 is an apocalyptic number.

It is an amenable number.

138798009 is a deficient number, since it is larger than the sum of its proper divisors (96204231).

138798009 is an equidigital number, since it uses as much as digits as its factorization.

138798009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 734397 (or 734391 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 45.

The square root of 138798009 is about 11781.2566816957. The cubic root of 138798009 is about 517.7591057021.

The spelling of 138798009 in words is "one hundred thirty-eight million, seven hundred ninety-eight thousand, nine".