215290 has 8 divisors (see below), whose sum is σ = 387540. Its totient is φ = 86112.

The previous prime is 215279. The next prime is 215297. The reversal of 215290 is 92512.

It can be written as a sum of positive squares in 2 ways, for example, as 201601 + 13689 = 449^2 + 117^2 .

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

It is not an unprimeable number, because it can be changed into a prime (215297) 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, 10755 + ... + 10774.

2²¹⁵²⁹⁰ is an apocalyptic number.

215290 is a deficient number, since it is larger than the sum of its proper divisors (172250).

215290 is a wasteful number, since it uses less digits than its factorization.

215290 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21536.

The product of its (nonzero) digits is 180, while the sum is 19.

The square root of 215290 is about 463.9935344377. The cubic root of 215290 is about 59.9341870967.

It can be divided in two parts, 215 and 290, that added together give a palindrome (505).

The spelling of 215290 in words is "two hundred fifteen thousand, two hundred ninety".