138090813 has 16 divisors (see below), whose sum is σ = 222802560. Its totient is φ = 74267136.

The previous prime is 138090793. The next prime is 138090817. The reversal of 138090813 is 318090831.

138090813 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 138090813 - 2⁹ = 138090301 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138090817) 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, 193048 + ... + 193761.

It is an arithmetic number, because the mean of its divisors is an integer number (13925160).

Almost surely, 2^138090813 is an apocalyptic number.

It is an amenable number.

138090813 is a deficient number, since it is larger than the sum of its proper divisors (84711747).

138090813 is a wasteful number, since it uses less digits than its factorization.

138090813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 386836.

The product of its (nonzero) digits is 5184, while the sum is 33.

The square root of 138090813 is about 11751.2047467483. The cubic root of 138090813 is about 516.8782553881.

The spelling of 138090813 in words is "one hundred thirty-eight million, ninety thousand, eight hundred thirteen".