189997305 has 16 divisors (see below), whose sum is σ = 304229760. Its totient is φ = 101253888.

The previous prime is 189997279. The next prime is 189997309. The reversal of 189997305 is 503799981.

It is a happy number.

189997305 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 189997305 - 2¹⁰ = 189996281 is a prime.

It is not an unprimeable number, because it can be changed into a prime (189997309) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19041 + ... + 27249.

It is an arithmetic number, because the mean of its divisors is an integer number (19014360).

Almost surely, 2^189997305 is an apocalyptic number.

189997305 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

189997305 is a deficient number, since it is larger than the sum of its proper divisors (114232455).

189997305 is a wasteful number, since it uses less digits than its factorization.

189997305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9760.

The product of its (nonzero) digits is 612360, while the sum is 51.

The square root of 189997305 is about 13783.9509938189. The cubic root of 189997305 is about 574.8869897627.

The spelling of 189997305 in words is "one hundred eighty-nine million, nine hundred ninety-seven thousand, three hundred five".