215242 has 4 divisors (see below), whose sum is σ = 322866. Its totient is φ = 107620.

The previous prime is 215239. The next prime is 215249. The reversal of 215242 is 242512.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 167281 + 47961 = 409^2 + 219^2 .

It is not an unprimeable number, because it can be changed into a prime (215249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 53809 + ... + 53812.

2²¹⁵²⁴² is an apocalyptic number.

215242 is a deficient number, since it is larger than the sum of its proper divisors (107624).

215242 is a wasteful number, since it uses less digits than its factorization.

215242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107623.

The product of its digits is 160, while the sum is 16.

The square root of 215242 is about 463.9418066956. The cubic root of 215242 is about 59.9297325550.

Adding to 215242 its reverse (242512), we get a palindrome (457754).

The spelling of 215242 in words is "two hundred fifteen thousand, two hundred forty-two".