138707189 has 4 divisors (see below), whose sum is σ = 139093920. Its totient is φ = 138320460.

The previous prime is 138707167. The next prime is 138707221. The reversal of 138707189 is 981707831.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-138707189 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 (138703189) 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, 192827 + ... + 193544.

It is an arithmetic number, because the mean of its divisors is an integer number (34773480).

Almost surely, 2^138707189 is an apocalyptic number.

It is an amenable number.

138707189 is a deficient number, since it is larger than the sum of its proper divisors (386731).

138707189 is an equidigital number, since it uses as much as digits as its factorization.

138707189 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 386730.

The product of its (nonzero) digits is 84672, while the sum is 44.

The square root of 138707189 is about 11777.4016234482. The cubic root of 138707189 is about 517.6461522521.

The spelling of 138707189 in words is "one hundred thirty-eight million, seven hundred seven thousand, one hundred eighty-nine".