215538 has 8 divisors (see below), whose sum is σ = 431088. Its totient is φ = 71844.

The previous prime is 215531. The next prime is 215563. The reversal of 215538 is 835512.

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

215538 is an admirable number.

It is a Curzon number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 215538.

It is not an unprimeable number, because it can be changed into a prime (215531) 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, 17956 + ... + 17967.

It is an arithmetic number, because the mean of its divisors is an integer number (53886).

2²¹⁵⁵³⁸ is an apocalyptic number.

215538 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

215538 is a wasteful number, since it uses less digits than its factorization.

215538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35928.

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

The square root of 215538 is about 464.2607026230. The cubic root of 215538 is about 59.9571916870.

The spelling of 215538 in words is "two hundred fifteen thousand, five hundred thirty-eight".