215273985 has 16 divisors (see below), whose sum is σ = 352840320. Its totient is φ = 112012160.

The previous prime is 215273983. The next prime is 215273987. The reversal of 215273985 is 589372512.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (215273983) and next prime (215273987).

It is not a de Polignac number, because 215273985 - 2¹ = 215273983 is a prime.

It is not an unprimeable number, because it can be changed into a prime (215273983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 174405 + ... + 175634.

It is an arithmetic number, because the mean of its divisors is an integer number (22052520).

Almost surely, 2^215273985 is an apocalyptic number.

It is an amenable number.

215273985 is a deficient number, since it is larger than the sum of its proper divisors (137566335).

215273985 is a wasteful number, since it uses less digits than its factorization.

215273985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 350088.

The product of its digits is 151200, while the sum is 42.

The square root of 215273985 is about 14672.2181349651. The cubic root of 215273985 is about 599.3270093103.

The spelling of 215273985 in words is "two hundred fifteen million, two hundred seventy-three thousand, nine hundred eighty-five".