215385 has 16 divisors (see below), whose sum is σ = 350784. Its totient is φ = 112832.

The previous prime is 215381. The next prime is 215389. The reversal of 215385 is 583512.

215385 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (215381) and next prime (215389).

It is a cyclic number.

It is not a de Polignac number, because 215385 - 2² = 215381 is a prime.

215385 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215381) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1159 + ... + 1331.

It is an arithmetic number, because the mean of its divisors is an integer number (21924).

2²¹⁵³⁸⁵ is an apocalyptic number.

It is an amenable number.

215385 is a deficient number, since it is larger than the sum of its proper divisors (135399).

215385 is a wasteful number, since it uses less digits than its factorization.

215385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 264.

The product of its digits is 1200, while the sum is 24.

The square root of 215385 is about 464.0958952630. The cubic root of 215385 is about 59.9430014254.

Subtracting from 215385 its product of digits (1200), we obtain a triangular number (214185 = T₆₅₄).

Adding to 215385 its reverse (583512), we get a palindrome (798897).

The spelling of 215385 in words is "two hundred fifteen thousand, three hundred eighty-five".