189724429 has 4 divisors (see below), whose sum is σ = 190821276. Its totient is φ = 188627584.

The previous prime is 189724421. The next prime is 189724441. The reversal of 189724429 is 924427981.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 924427981 = 73 ⋅12663397.

It can be written as a sum of positive squares in 2 ways, for example, as 171217225 + 18507204 = 13085^2 + 4302^2 .

It is a cyclic number.

It is not a de Polignac number, because 189724429 - 2³ = 189724421 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 (189724421) 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, 548164 + ... + 548509.

It is an arithmetic number, because the mean of its divisors is an integer number (47705319).

Almost surely, 2^189724429 is an apocalyptic number.

It is an amenable number.

189724429 is a deficient number, since it is larger than the sum of its proper divisors (1096847).

189724429 is a wasteful number, since it uses less digits than its factorization.

189724429 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1096846.

The product of its digits is 290304, while the sum is 46.

The square root of 189724429 is about 13774.0491141857. The cubic root of 189724429 is about 574.6116384484.

The spelling of 189724429 in words is "one hundred eighty-nine million, seven hundred twenty-four thousand, four hundred twenty-nine".