138403189 has 8 divisors (see below), whose sum is σ = 144343808. Its totient is φ = 132554880.

The previous prime is 138403183. The next prime is 138403217. The reversal of 138403189 is 981304831.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 138403189 - 2⁷ = 138403061 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 (138403183) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20007 + ... + 26020.

It is an arithmetic number, because the mean of its divisors is an integer number (18042976).

Almost surely, 2^138403189 is an apocalyptic number.

It is an amenable number.

138403189 is a deficient number, since it is larger than the sum of its proper divisors (5940619).

138403189 is an equidigital number, since it uses as much as digits as its factorization.

138403189 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46155.

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

The square root of 138403189 is about 11764.4884716676. The cubic root of 138403189 is about 517.2677062728.

The spelling of 138403189 in words is "one hundred thirty-eight million, four hundred three thousand, one hundred eighty-nine".