189845431 has 4 divisors (see below), whose sum is σ = 190906200. Its totient is φ = 188784664.

The previous prime is 189845429. The next prime is 189845441. The reversal of 189845431 is 134548981.

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 189845431 - 2¹ = 189845429 is a prime.

It is a super-2 number, since 2×189845431² = 72082575343151522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189845441) 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, 530116 + ... + 530473.

It is an arithmetic number, because the mean of its divisors is an integer number (47726550).

Almost surely, 2^189845431 is an apocalyptic number.

189845431 is a deficient number, since it is larger than the sum of its proper divisors (1060769).

189845431 is a wasteful number, since it uses less digits than its factorization.

189845431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1060768.

The product of its digits is 138240, while the sum is 43.

The square root of 189845431 is about 13778.4408043871. The cubic root of 189845431 is about 574.7337706407.

The spelling of 189845431 in words is "one hundred eighty-nine million, eight hundred forty-five thousand, four hundred thirty-one".