180869 has 4 divisors (see below), whose sum is σ = 194796. Its totient is φ = 166944.

The previous prime is 180847. The next prime is 180871. The reversal of 180869 is 968081.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 968081 = 701 ⋅1381.

It can be written as a sum of positive squares in 2 ways, for example, as 68644 + 112225 = 262^2 + 335^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-180869 is a prime.

It is a super-2 number, since 2×180869² = 65427190322, which contains 22 as substring.

It is a Duffinian number.

It is a plaindrome in base 15.

It is a nialpdrome in base 13.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 180869.

It is not an unprimeable number, because it can be changed into a prime (180569) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6944 + ... + 6969.

It is an arithmetic number, because the mean of its divisors is an integer number (48699).

2¹⁸⁰⁸⁶⁹ is an apocalyptic number.

It is an amenable number.

180869 is a deficient number, since it is larger than the sum of its proper divisors (13927).

180869 is a wasteful number, since it uses less digits than its factorization.

180869 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13926.

The product of its (nonzero) digits is 3456, while the sum is 32.

The square root of 180869 is about 425.2869619445. The cubic root of 180869 is about 56.5528781594.

Adding to 180869 its sum of digits (32), we get a triangular number (180901 = T₆₀₁).

The spelling of 180869 in words is "one hundred eighty thousand, eight hundred sixty-nine".