215943 has 24 divisors (see below), whose sum is σ = 363888. Its totient is φ = 112896.

The previous prime is 215939. The next prime is 215953. The reversal of 215943 is 349512.

215943 is nontrivially palindromic in base 4.

It is not a de Polignac number, because 215943 - 2² = 215939 is a prime.

215943 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215953) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1855 + ... + 1967.

It is an arithmetic number, because the mean of its divisors is an integer number (15162).

2²¹⁵⁹⁴³ is an apocalyptic number.

215943 is a deficient number, since it is larger than the sum of its proper divisors (147945).

215943 is a wasteful number, since it uses less digits than its factorization.

215943 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143 (or 136 counting only the distinct ones).

The product of its digits is 1080, while the sum is 24.

The square root of 215943 is about 464.6966752625. The cubic root of 215943 is about 59.9947217579.

The spelling of 215943 in words is "two hundred fifteen thousand, nine hundred forty-three".