189680805 has 32 divisors (see below), whose sum is σ = 341020800. Its totient is φ = 100020096.

The previous prime is 189680779. The next prime is 189680809. The reversal of 189680805 is 508086981.

189680805 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 189680805 - 2⁵ = 189680773 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189680809) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4122 + ... + 19908.

It is an arithmetic number, because the mean of its divisors is an integer number (10656900).

Almost surely, 2^189680805 is an apocalyptic number.

189680805 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

189680805 is a deficient number, since it is larger than the sum of its proper divisors (151339995).

189680805 is a wasteful number, since it uses less digits than its factorization.

189680805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15890 (or 15884 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 45.

The square root of 189680805 is about 13772.4654655584. The cubic root of 189680805 is about 574.5675942527.

The spelling of 189680805 in words is "one hundred eighty-nine million, six hundred eighty thousand, eight hundred five".