215465 has 4 divisors (see below), whose sum is σ = 258564. Its totient is φ = 172368.

The previous prime is 215461. The next prime is 215471. The reversal of 215465 is 564512.

215465 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 71824 + 143641 = 268^2 + 379^2 .

It is a cyclic number.

It is not a de Polignac number, because 215465 - 2² = 215461 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 215465.

It is not an unprimeable number, because it can be changed into a prime (215461) 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, 21542 + ... + 21551.

It is an arithmetic number, because the mean of its divisors is an integer number (64641).

2²¹⁵⁴⁶⁵ is an apocalyptic number.

It is an amenable number.

215465 is a deficient number, since it is larger than the sum of its proper divisors (43099).

215465 is an equidigital number, since it uses as much as digits as its factorization.

215465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43098.

The product of its digits is 1200, while the sum is 23.

The square root of 215465 is about 464.1820763450. The cubic root of 215465 is about 59.9504220080.

Adding to 215465 its reverse (564512), we get a palindrome (779977).

The spelling of 215465 in words is "two hundred fifteen thousand, four hundred sixty-five".