215145387 has 24 divisors (see below), whose sum is σ = 329799600. Its totient is φ = 134684160.

The previous prime is 215145349. The next prime is 215145389. The reversal of 215145387 is 783541512.

It is not a de Polignac number, because 215145387 - 2⁶ = 215145323 is a prime.

It is a zygodrome in base 3.

It is not an unprimeable number, because it can be changed into a prime (215145389) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 78364 + ... + 81062.

It is an arithmetic number, because the mean of its divisors is an integer number (13741650).

Almost surely, 2^215145387 is an apocalyptic number.

215145387 is a deficient number, since it is larger than the sum of its proper divisors (114654213).

215145387 is a wasteful number, since it uses less digits than its factorization.

215145387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3243 (or 3240 counting only the distinct ones).

The product of its digits is 33600, while the sum is 36.

The square root of 215145387 is about 14667.8351163353. The cubic root of 215145387 is about 599.2076457519.

Adding to 215145387 its reverse (783541512), we get a palindrome (998686899).

The spelling of 215145387 in words is "two hundred fifteen million, one hundred forty-five thousand, three hundred eighty-seven".