215984465 has 4 divisors (see below), whose sum is σ = 259181364. Its totient is φ = 172787568.

The previous prime is 215984459. The next prime is 215984477. The reversal of 215984465 is 564489512.

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

It can be written as a sum of positive squares in 2 ways, for example, as 117657409 + 98327056 = 10847^2 + 9916^2 .

It is a cyclic number.

It is not a de Polignac number, because 215984465 - 2¹⁰ = 215983441 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21598442 + ... + 21598451.

It is an arithmetic number, because the mean of its divisors is an integer number (64795341).

Almost surely, 2^215984465 is an apocalyptic number.

It is an amenable number.

215984465 is a deficient number, since it is larger than the sum of its proper divisors (43196899).

215984465 is an equidigital number, since it uses as much as digits as its factorization.

215984465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43196898.

The product of its digits is 345600, while the sum is 44.

The square root of 215984465 is about 14696.4099357632. The cubic root of 215984465 is about 599.9856153959.

The spelling of 215984465 in words is "two hundred fifteen million, nine hundred eighty-four thousand, four hundred sixty-five".