215870 has 8 divisors (see below), whose sum is σ = 388584. Its totient is φ = 86344.

The previous prime is 215863. The next prime is 215893. The reversal of 215870 is 78512.

215870 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-3 number, since 3×215870³ = 30178533327009000, which contains 333 as substring.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 215870.

It is an unprimeable number.

215870 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10784 + ... + 10803.

It is an arithmetic number, because the mean of its divisors is an integer number (48573).

2²¹⁵⁸⁷⁰ is an apocalyptic number.

215870 is a deficient number, since it is larger than the sum of its proper divisors (172714).

215870 is a wasteful number, since it uses less digits than its factorization.

215870 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21594.

The product of its (nonzero) digits is 560, while the sum is 23.

The square root of 215870 is about 464.6181227632. The cubic root of 215870 is about 59.9879605473.

The spelling of 215870 in words is "two hundred fifteen thousand, eight hundred seventy".