189991293 has 8 divisors (see below), whose sum is σ = 264335808. Its totient is φ = 121153824.

The previous prime is 189991289. The next prime is 189991301. The reversal of 189991293 is 392199981.

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

It is not a de Polignac number, because 189991293 - 2² = 189991289 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189991213) 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, 1376680 + ... + 1376817.

It is an arithmetic number, because the mean of its divisors is an integer number (33041976).

Almost surely, 2^189991293 is an apocalyptic number.

It is an amenable number.

189991293 is a deficient number, since it is larger than the sum of its proper divisors (74344515).

189991293 is a wasteful number, since it uses less digits than its factorization.

189991293 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2753523.

The product of its digits is 314928, while the sum is 51.

The square root of 189991293 is about 13783.7329123863. The cubic root of 189991293 is about 574.8809260679.

The spelling of 189991293 in words is "one hundred eighty-nine million, nine hundred ninety-one thousand, two hundred ninety-three".