215849 has 4 divisors (see below), whose sum is σ = 228564. Its totient is φ = 203136.

The previous prime is 215843. The next prime is 215851. The reversal of 215849 is 948512.

215849 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 105625 + 110224 = 325^2 + 332^2 .

It is a cyclic number.

It is not a de Polignac number, because 215849 - 2⁴ = 215833 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (215843) 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, 6332 + ... + 6365.

It is an arithmetic number, because the mean of its divisors is an integer number (57141).

2²¹⁵⁸⁴⁹ is an apocalyptic number.

It is an amenable number.

215849 is a deficient number, since it is larger than the sum of its proper divisors (12715).

215849 is a wasteful number, since it uses less digits than its factorization.

215849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12714.

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

The square root of 215849 is about 464.5955230090. The cubic root of 215849 is about 59.9860152592.

It can be divided in two parts, 2 and 15849, that added together give a palindrome (15851).

The spelling of 215849 in words is "two hundred fifteen thousand, eight hundred forty-nine".