215843 has 2 divisors, whose sum is σ = 215844. Its totient is φ = 215842.

The previous prime is 215833. The next prime is 215851. The reversal of 215843 is 348512.

215843 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 215843 - 2⁴ = 215827 is a prime.

It is an Ulam number.

It is equal to p₁₉₂₇₄ and since 215843 and 19274 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (215833) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107921 + 107922.

It is an arithmetic number, because the mean of its divisors is an integer number (107922).

2²¹⁵⁸⁴³ is an apocalyptic number.

215843 is a deficient number, since it is larger than the sum of its proper divisors (1).

215843 is an equidigital number, since it uses as much as digits as its factorization.

215843 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 960, while the sum is 23.

The square root of 215843 is about 464.5890657344. The cubic root of 215843 is about 59.9854594394.

The spelling of 215843 in words is "two hundred fifteen thousand, eight hundred forty-three".