189938489 has 8 divisors (see below), whose sum is σ = 206536512. Its totient is φ = 173624400.

The previous prime is 189938473. The next prime is 189938491. The reversal of 189938489 is 984839981.

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 189938489 - 2⁴ = 189938473 is a prime.

It is not an unprimeable number, because it can be changed into a prime (189938449) 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, 69587 + ... + 72264.

It is an arithmetic number, because the mean of its divisors is an integer number (25817064).

Almost surely, 2^189938489 is an apocalyptic number.

It is an amenable number.

189938489 is a deficient number, since it is larger than the sum of its proper divisors (16598023).

189938489 is a wasteful number, since it uses less digits than its factorization.

189938489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141967.

The product of its digits is 4478976, while the sum is 59.

The square root of 189938489 is about 13781.8173329935. The cubic root of 189938489 is about 574.8276625303.

The spelling of 189938489 in words is "one hundred eighty-nine million, nine hundred thirty-eight thousand, four hundred eighty-nine".