215144 has 8 divisors (see below), whose sum is σ = 403410. Its totient is φ = 107568.

The previous prime is 215143. The next prime is 215153. The reversal of 215144 is 441512.

215144 = 42² + 43² + ... + 89².

215144 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 131044 + 84100 = 362^2 + 290^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (215141) 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 as a sum of consecutive naturals, namely, 13439 + ... + 13454.

2²¹⁵¹⁴⁴ is an apocalyptic number.

It is an amenable number.

215144 is a deficient number, since it is larger than the sum of its proper divisors (188266).

215144 is a wasteful number, since it uses less digits than its factorization.

215144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26899 (or 26895 counting only the distinct ones).

The product of its digits is 160, while the sum is 17.

The square root of 215144 is about 463.8361779767. The cubic root of 215144 is about 59.9206358091.

Adding to 215144 its reverse (441512), we get a palindrome (656656).

The spelling of 215144 in words is "two hundred fifteen thousand, one hundred forty-four".