189777379 has 4 divisors (see below), whose sum is σ = 207029880. Its totient is φ = 172524880.

The previous prime is 189777331. The next prime is 189777383. The reversal of 189777379 is 973777981.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 973777981 = 11 ⋅88525271.

It is not a de Polignac number, because 189777379 - 2²³ = 181388771 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (189777179) 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 3 ways as a sum of consecutive naturals, for example, 8626234 + ... + 8626255.

It is an arithmetic number, because the mean of its divisors is an integer number (51757470).

Almost surely, 2^189777379 is an apocalyptic number.

189777379 is a deficient number, since it is larger than the sum of its proper divisors (17252501).

189777379 is a wasteful number, since it uses less digits than its factorization.

189777379 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17252500.

The product of its digits is 4667544, while the sum is 58.

The square root of 189777379 is about 13775.9710728500. The cubic root of 189777379 is about 574.6650894042.

The spelling of 189777379 in words is "one hundred eighty-nine million, seven hundred seventy-seven thousand, three hundred seventy-nine".