215489 has 4 divisors (see below), whose sum is σ = 216660. Its totient is φ = 214320.

The previous prime is 215483. The next prime is 215497. The reversal of 215489 is 984512.

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.

It can be written as a sum of positive squares in 2 ways, for example, as 172225 + 43264 = 415^2 + 208^2 .

It is a cyclic number.

It is not a de Polignac number, because 215489 - 2¹⁶ = 149953 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a plaindrome in base 11.

It is a nialpdrome in base 13.

It is a zygodrome in base 13.

It is not an unprimeable number, because it can be changed into a prime (215483) 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, 242 + ... + 699.

It is an arithmetic number, because the mean of its divisors is an integer number (54165).

2²¹⁵⁴⁸⁹ is an apocalyptic number.

It is an amenable number.

215489 is a deficient number, since it is larger than the sum of its proper divisors (1171).

215489 is an equidigital number, since it uses as much as digits as its factorization.

215489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1170.

The product of its digits is 2880, while the sum is 29.

The square root of 215489 is about 464.2079275497. The cubic root of 215489 is about 59.9526478245.

The spelling of 215489 in words is "two hundred fifteen thousand, four hundred eighty-nine".