189390479 has 4 divisors (see below), whose sum is σ = 191672376. Its totient is φ = 187108584.

The previous prime is 189390433. The next prime is 189390491. The reversal of 189390479 is 974093981.

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

It is a cyclic number.

It is not a de Polignac number, because 189390479 - 2¹² = 189386383 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 (189390079) 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, 1140824 + ... + 1140989.

It is an arithmetic number, because the mean of its divisors is an integer number (47918094).

Almost surely, 2^189390479 is an apocalyptic number.

189390479 is a deficient number, since it is larger than the sum of its proper divisors (2281897).

189390479 is an equidigital number, since it uses as much as digits as its factorization.

189390479 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2281896.

The product of its (nonzero) digits is 489888, while the sum is 50.

The square root of 189390479 is about 13761.9213411500. The cubic root of 189390479 is about 574.2742996107.

The spelling of 189390479 in words is "one hundred eighty-nine million, three hundred ninety thousand, four hundred seventy-nine".