215387 has 4 divisors (see below), whose sum is σ = 220440. Its totient is φ = 210336.

The previous prime is 215381. The next prime is 215389. The reversal of 215387 is 783512.

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

It is a cyclic number.

It is not a de Polignac number, because 215387 - 2¹⁰ = 214363 is a prime.

It is a Duffinian number.

215387 is a modest number, since divided by 387 gives 215 as remainder.

It is not an unprimeable number, because it can be changed into a prime (215381) 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, 2462 + ... + 2547.

It is an arithmetic number, because the mean of its divisors is an integer number (55110).

2²¹⁵³⁸⁷ is an apocalyptic number.

215387 is a deficient number, since it is larger than the sum of its proper divisors (5053).

215387 is an equidigital number, since it uses as much as digits as its factorization.

215387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5052.

The product of its digits is 1680, while the sum is 26.

The square root of 215387 is about 464.0980499851. The cubic root of 215387 is about 59.9431869624.

Adding to 215387 its reverse (783512), we get a palindrome (998899).

The spelling of 215387 in words is "two hundred fifteen thousand, three hundred eighty-seven".