189768977 has 4 divisors (see below), whose sum is σ = 200931876. Its totient is φ = 178606080.

The previous prime is 189768961. The next prime is 189769003. The reversal of 189768977 is 779867981.

189768977 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 156775441 + 32993536 = 12521^2 + 5744^2 .

It is not a de Polignac number, because 189768977 - 2⁴ = 189768961 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (189768077) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5581424 + ... + 5581457.

It is an arithmetic number, because the mean of its divisors is an integer number (50232969).

Almost surely, 2^189768977 is an apocalyptic number.

189768977 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

189768977 is a deficient number, since it is larger than the sum of its proper divisors (11162899).

189768977 is a wasteful number, since it uses less digits than its factorization.

189768977 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11162898.

The product of its digits is 10668672, while the sum is 62.

The square root of 189768977 is about 13775.6661181955. Note that the first 3 decimals coincide. The cubic root of 189768977 is about 574.6566085772.

The spelling of 189768977 in words is "one hundred eighty-nine million, seven hundred sixty-eight thousand, nine hundred seventy-seven".