189911807 has 8 divisors (see below), whose sum is σ = 197484240. Its totient is φ = 182407680.

The previous prime is 189911767. The next prime is 189911833. The reversal of 189911807 is 708119981.

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

It is not a de Polignac number, because 189911807 - 2²⁰ = 188863231 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 (189911867) 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, 11369 + ... + 22562.

It is an arithmetic number, because the mean of its divisors is an integer number (24685530).

Almost surely, 2^189911807 is an apocalyptic number.

189911807 is a deficient number, since it is larger than the sum of its proper divisors (7572433).

189911807 is a wasteful number, since it uses less digits than its factorization.

189911807 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34153.

The product of its (nonzero) digits is 36288, while the sum is 44.

The square root of 189911807 is about 13780.8492844237. The cubic root of 189911807 is about 574.8007445703.

The spelling of 189911807 in words is "one hundred eighty-nine million, nine hundred eleven thousand, eight hundred seven".