215415 has 12 divisors (see below), whose sum is σ = 373464. Its totient is φ = 114864.

The previous prime is 215399. The next prime is 215417. The reversal of 215415 is 514512.

It is not a de Polignac number, because 215415 - 2⁴ = 215399 is a prime.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215417) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2349 + ... + 2438.

It is an arithmetic number, because the mean of its divisors is an integer number (31122).

2²¹⁵⁴¹⁵ is an apocalyptic number.

215415 is a deficient number, since it is larger than the sum of its proper divisors (158049).

215415 is a wasteful number, since it uses less digits than its factorization.

215415 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4798 (or 4795 counting only the distinct ones).

The product of its digits is 200, while the sum is 18.

The square root of 215415 is about 464.1282150441. The cubic root of 215415 is about 59.9457843592.

Adding to 215415 its reverse (514512), we get a palindrome (729927).

It can be divided in two parts, 215 and 415, that added together give a triangular number (630 = T₃₅).

The spelling of 215415 in words is "two hundred fifteen thousand, four hundred fifteen".