189391049 has 8 divisors (see below), whose sum is σ = 199034880. Its totient is φ = 179985456.

The previous prime is 189391043. The next prime is 189391057. The reversal of 189391049 is 940193981.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-189391049 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (189391043) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 57929 + ... + 61110.

It is an arithmetic number, because the mean of its divisors is an integer number (24879360).

Almost surely, 2^189391049 is an apocalyptic number.

It is an amenable number.

189391049 is a deficient number, since it is larger than the sum of its proper divisors (9643831).

189391049 is a wasteful number, since it uses less digits than its factorization.

189391049 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 119119.

The product of its (nonzero) digits is 69984, while the sum is 44.

The square root of 189391049 is about 13761.9420504520. The cubic root of 189391049 is about 574.2748757326.

The spelling of 189391049 in words is "one hundred eighty-nine million, three hundred ninety-one thousand, forty-nine".