215312 has 10 divisors (see below), whose sum is σ = 417198. Its totient is φ = 107648.

The previous prime is 215309. The next prime is 215317. The reversal of 215312 is 213512.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 215296 + 16 = 464^2 + 4^2 .

It is a nialpdrome in base 8.

It is not an unprimeable number, because it can be changed into a prime (215317) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6713 + ... + 6744.

2²¹⁵³¹² is an apocalyptic number.

It is an amenable number.

215312 is a deficient number, since it is larger than the sum of its proper divisors (201886).

215312 is a wasteful number, since it uses less digits than its factorization.

215312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13465 (or 13459 counting only the distinct ones).

The product of its digits is 60, while the sum is 14.

The square root of 215312 is about 464.0172410590. The cubic root of 215312 is about 59.9362285403.

Adding to 215312 its reverse (213512), we get a palindrome (428824).

The spelling of 215312 in words is "two hundred fifteen thousand, three hundred twelve".