189038909 has 8 divisors (see below), whose sum is σ = 198197952. Its totient is φ = 179958240.

The previous prime is 189038903. The next prime is 189038911. The reversal of 189038909 is 909830981.

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 189038909 - 2²⁴ = 172261693 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189038903) 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, 14624 + ... + 24329.

It is an arithmetic number, because the mean of its divisors is an integer number (24774744).

Almost surely, 2^189038909 is an apocalyptic number.

It is an amenable number.

189038909 is a deficient number, since it is larger than the sum of its proper divisors (9159043).

189038909 is a wasteful number, since it uses less digits than its factorization.

189038909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39187.

The product of its (nonzero) digits is 139968, while the sum is 47.

The square root of 189038909 is about 13749.1421186924. The cubic root of 189038909 is about 573.9187332086.

The spelling of 189038909 in words is "one hundred eighty-nine million, thirty-eight thousand, nine hundred nine".