215440015 has 16 divisors (see below), whose sum is σ = 301492800. Its totient is φ = 147729120.

The previous prime is 215440003. The next prime is 215440021. The reversal of 215440015 is 510044512.

It is not a de Polignac number, because 215440015 - 2¹⁷ = 215308943 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 61096 + ... + 64525.

It is an arithmetic number, because the mean of its divisors is an integer number (18843300).

Almost surely, 2^215440015 is an apocalyptic number.

215440015 is a deficient number, since it is larger than the sum of its proper divisors (86052785).

215440015 is an equidigital number, since it uses as much as digits as its factorization.

215440015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125647 (or 125633 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 22.

The square root of 215440015 is about 14677.8750165002. The cubic root of 215440015 is about 599.4810466455.

Adding to 215440015 its reverse (510044512), we get a palindrome (725484527).

The spelling of 215440015 in words is "two hundred fifteen million, four hundred forty thousand, fifteen".