189764399 has 8 divisors (see below), whose sum is σ = 209637120. Its totient is φ = 170328600.

The previous prime is 189764389. The next prime is 189764413. The reversal of 189764399 is 993467981.

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 189764399 - 2⁸ = 189764143 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189764339) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 108317 + ... + 110054.

It is an arithmetic number, because the mean of its divisors is an integer number (26204640).

Almost surely, 2^189764399 is an apocalyptic number.

189764399 is a deficient number, since it is larger than the sum of its proper divisors (19872721).

189764399 is a wasteful number, since it uses less digits than its factorization.

189764399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 218461.

The product of its digits is 2939328, while the sum is 56.

The square root of 189764399 is about 13775.4999546296. The cubic root of 189764399 is about 574.6519875214.

The spelling of 189764399 in words is "one hundred eighty-nine million, seven hundred sixty-four thousand, three hundred ninety-nine".