138322189 has 4 divisors (see below), whose sum is σ = 138455100. Its totient is φ = 138189280.

The previous prime is 138322159. The next prime is 138322229. The reversal of 138322189 is 981223831.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 61496964 + 76825225 = 7842^2 + 8765^2 .

It is a cyclic number.

It is not a de Polignac number, because 138322189 - 2⁵ = 138322157 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 (138322159) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64882 + ... + 66979.

It is an arithmetic number, because the mean of its divisors is an integer number (34613775).

Almost surely, 2^138322189 is an apocalyptic number.

It is an amenable number.

138322189 is a deficient number, since it is larger than the sum of its proper divisors (132911).

138322189 is a wasteful number, since it uses less digits than its factorization.

138322189 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132910.

The product of its digits is 20736, while the sum is 37.

The square root of 138322189 is about 11761.0454042147. The cubic root of 138322189 is about 517.1667768533.

The spelling of 138322189 in words is "one hundred thirty-eight million, three hundred twenty-two thousand, one hundred eighty-nine".