189643791 has 8 divisors (see below), whose sum is σ = 252985264. Its totient is φ = 126365760.

The previous prime is 189643787. The next prime is 189643793. The reversal of 189643791 is 197346981.

It is a happy number.

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

It is not a de Polignac number, because 189643791 - 2² = 189643787 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 189643791.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189643793) 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, 8380 + ... + 21201.

It is an arithmetic number, because the mean of its divisors is an integer number (31623158).

Almost surely, 2^189643791 is an apocalyptic number.

189643791 is a deficient number, since it is larger than the sum of its proper divisors (63341473).

189643791 is a wasteful number, since it uses less digits than its factorization.

189643791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31721.

The product of its digits is 326592, while the sum is 48.

The square root of 189643791 is about 13771.1216318788. The cubic root of 189643791 is about 574.5302184300.

The spelling of 189643791 in words is "one hundred eighty-nine million, six hundred forty-three thousand, seven hundred ninety-one".