189769391 has 8 divisors (see below), whose sum is σ = 217908864. Its totient is φ = 161887320.

The previous prime is 189769381. The next prime is 189769403. The reversal of 189769391 is 193967981.

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

It is not a de Polignac number, because 189769391 - 2²² = 185575087 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 (189769381) 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, 62765 + ... + 65718.

It is an arithmetic number, because the mean of its divisors is an integer number (27238608).

Almost surely, 2^189769391 is an apocalyptic number.

189769391 is a deficient number, since it is larger than the sum of its proper divisors (28139473).

189769391 is a wasteful number, since it uses less digits than its factorization.

189769391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128701.

The product of its digits is 734832, while the sum is 53.

The square root of 189769391 is about 13775.6811446839. The cubic root of 189769391 is about 574.6570264672.

The spelling of 189769391 in words is "one hundred eighty-nine million, seven hundred sixty-nine thousand, three hundred ninety-one".