189731 has 4 divisors (see below), whose sum is σ = 190632. Its totient is φ = 188832.

The previous prime is 189713. The next prime is 189733. The reversal of 189731 is 137981.

189731 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 a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 137981 = 31 ⋅4451.

It is a cyclic number.

It is not a de Polignac number, because 189731 - 2¹⁰ = 188707 is a prime.

It is a super-2 number, since 2×189731² = 71995704722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 189694 and 189703.

It is not an unprimeable number, because it can be changed into a prime (189733) 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, 56 + ... + 618.

It is an arithmetic number, because the mean of its divisors is an integer number (47658).

2¹⁸⁹⁷³¹ is an apocalyptic number.

189731 is a deficient number, since it is larger than the sum of its proper divisors (901).

189731 is an equidigital number, since it uses as much as digits as its factorization.

189731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 900.

The product of its digits is 1512, while the sum is 29.

The square root of 189731 is about 435.5812208992. The cubic root of 189731 is about 57.4618272157.

The spelling of 189731 in words is "one hundred eighty-nine thousand, seven hundred thirty-one".