138109213 has 16 divisors (see below), whose sum is σ = 153014400. Its totient is φ = 123612480.

The previous prime is 138109193. The next prime is 138109243. The reversal of 138109213 is 312901831.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-138109213 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138109243) 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 15 ways as a sum of consecutive naturals, for example, 274320 + ... + 274822.

It is an arithmetic number, because the mean of its divisors is an integer number (9563400).

Almost surely, 2^138109213 is an apocalyptic number.

It is an amenable number.

138109213 is a deficient number, since it is larger than the sum of its proper divisors (14905187).

138109213 is a wasteful number, since it uses less digits than its factorization.

138109213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 852.

The product of its (nonzero) digits is 1296, while the sum is 28.

The square root of 138109213 is about 11751.9876191221. The cubic root of 138109213 is about 516.9012116280.

The spelling of 138109213 in words is "one hundred thirty-eight million, one hundred nine thousand, two hundred thirteen".