189431 has 8 divisors (see below), whose sum is σ = 219024. Its totient is φ = 161920.

The previous prime is 189421. The next prime is 189433. The reversal of 189431 is 134981.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 189431 - 2¹⁰ = 188407 is a prime.

It is a super-2 number, since 2×189431² = 71768207522, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 189431.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 320 + ... + 693.

It is an arithmetic number, because the mean of its divisors is an integer number (27378).

2¹⁸⁹⁴³¹ is an apocalyptic number.

189431 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

189431 is a deficient number, since it is larger than the sum of its proper divisors (29593).

189431 is a wasteful number, since it uses less digits than its factorization.

189431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1041.

The product of its digits is 864, while the sum is 26.

The square root of 189431 is about 435.2367172011. The cubic root of 189431 is about 57.4315252936.

It can be divided in two parts, 18 and 9431, that added together give a palindrome (9449).

The spelling of 189431 in words is "one hundred eighty-nine thousand, four hundred thirty-one".