215790 has 16 divisors (see below), whose sum is σ = 517968. Its totient is φ = 57536.

The previous prime is 215771. The next prime is 215797. The reversal of 215790 is 97512.

It is a Curzon number.

It is a plaindrome in base 16.

It is a self number, because there is not a number n which added to its sum of digits gives 215790.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215797) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 3567 + ... + 3626.

It is an arithmetic number, because the mean of its divisors is an integer number (32373).

2²¹⁵⁷⁹⁰ is an apocalyptic number.

215790 is an abundant number, since it is smaller than the sum of its proper divisors (302178).

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

215790 is a wasteful number, since it uses less digits than its factorization.

215790 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7203.

The product of its (nonzero) digits is 630, while the sum is 24.

The square root of 215790 is about 464.5320225776. The cubic root of 215790 is about 59.9805492507.

The spelling of 215790 in words is "two hundred fifteen thousand, seven hundred ninety".