215936945 has 8 divisors (see below), whose sum is σ = 296142144. Its totient is φ = 148071024.

The previous prime is 215936933. The next prime is 215936947. The reversal of 215936945 is 549639512.

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

It is a cyclic number.

It is not a de Polignac number, because 215936945 - 2⁸ = 215936689 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 215936896 and 215936905.

It is not an unprimeable number, because it can be changed into a prime (215936947) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3084779 + ... + 3084848.

It is an arithmetic number, because the mean of its divisors is an integer number (37017768).

Almost surely, 2^215936945 is an apocalyptic number.

It is an amenable number.

215936945 is a deficient number, since it is larger than the sum of its proper divisors (80205199).

215936945 is an equidigital number, since it uses as much as digits as its factorization.

215936945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6169639.

The product of its digits is 291600, while the sum is 44.

The square root of 215936945 is about 14694.7931254577. The cubic root of 215936945 is about 599.9416100586.

The spelling of 215936945 in words is "two hundred fifteen million, nine hundred thirty-six thousand, nine hundred forty-five".