215972015 has 16 divisors (see below), whose sum is σ = 303080448. Its totient is φ = 144650016.

The previous prime is 215971967. The next prime is 215972023. The reversal of 215972015 is 510279512.

It is a happy number.

It is not a de Polignac number, because 215972015 - 2¹⁰ = 215970991 is a prime.

It is a super-2 number, since 2×215972015² = 93287822526320450, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 70247 + ... + 73256.

It is an arithmetic number, because the mean of its divisors is an integer number (18942528).

Almost surely, 2^215972015 is an apocalyptic number.

215972015 is a deficient number, since it is larger than the sum of its proper divisors (87108433).

215972015 is a wasteful number, since it uses less digits than its factorization.

215972015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 143558.

The product of its (nonzero) digits is 6300, while the sum is 32.

The square root of 215972015 is about 14695.9863568255. The cubic root of 215972015 is about 599.9740868438.

The spelling of 215972015 in words is "two hundred fifteen million, nine hundred seventy-two thousand, fifteen".