189861079 has 4 divisors (see below), whose sum is σ = 189893160. Its totient is φ = 189829000.

The previous prime is 189861071. The next prime is 189861137. The reversal of 189861079 is 970168981.

189861079 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, and also an emirpimes, since its reverse is a distinct semiprime: 970168981 = 3313 ⋅292837.

It is a cyclic number.

It is not a de Polignac number, because 189861079 - 2³ = 189861071 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 (189861071) 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, 4297 + ... + 19954.

It is an arithmetic number, because the mean of its divisors is an integer number (47473290).

Almost surely, 2^189861079 is an apocalyptic number.

189861079 is a deficient number, since it is larger than the sum of its proper divisors (32081).

189861079 is an equidigital number, since it uses as much as digits as its factorization.

189861079 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32080.

The product of its (nonzero) digits is 217728, while the sum is 49.

The square root of 189861079 is about 13779.0086363279. The cubic root of 189861079 is about 574.7495610074.

The spelling of 189861079 in words is "one hundred eighty-nine million, eight hundred sixty-one thousand, seventy-nine".