215853 has 16 divisors (see below), whose sum is σ = 325632. Its totient is φ = 126000.

The previous prime is 215851. The next prime is 215857. The reversal of 215853 is 358512.

It is not a de Polignac number, because 215853 - 2¹ = 215851 is a prime.

It is a Curzon number.

It is a nialpdrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215851) 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, 918 + ... + 1128.

It is an arithmetic number, because the mean of its divisors is an integer number (20352).

2²¹⁵⁸⁵³ is an apocalyptic number.

It is an amenable number.

215853 is a deficient number, since it is larger than the sum of its proper divisors (109779).

215853 is a wasteful number, since it uses less digits than its factorization.

215853 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 256.

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

The square root of 215853 is about 464.5998278088. The cubic root of 215853 is about 59.9863858000.

It can be divided in two parts, 2158 and 53, that added together give a triangular number (2211 = T₆₆).

The spelling of 215853 in words is "two hundred fifteen thousand, eight hundred fifty-three".