215442985 has 8 divisors (see below), whose sum is σ = 258652296. Its totient is φ = 172273920.

The previous prime is 215442979. The next prime is 215442991. The reversal of 215442985 is 589244512.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (215442979) and next prime (215442991).

It can be written as a sum of positive squares in 4 ways, for example, as 44983849 + 170459136 = 6707^2 + 13056^2 .

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

It is not a de Polignac number, because 215442985 - 2³ = 215442977 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3345 + ... + 21025.

It is an arithmetic number, because the mean of its divisors is an integer number (32331537).

Almost surely, 2^215442985 is an apocalyptic number.

It is an amenable number.

215442985 is a deficient number, since it is larger than the sum of its proper divisors (43209311).

215442985 is a wasteful number, since it uses less digits than its factorization.

215442985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20123.

The product of its digits is 115200, while the sum is 40.

The square root of 215442985 is about 14677.9761888348. The cubic root of 215442985 is about 599.4838013961.

The spelling of 215442985 in words is "two hundred fifteen million, four hundred forty-two thousand, nine hundred eighty-five".