856532215 has 32 divisors (see below), whose sum is σ = 1283304960. Its totient is φ = 533174400.

The previous prime is 856532177. The next prime is 856532227. The reversal of 856532215 is 512235658.

It is a happy number.

It is not a de Polignac number, because 856532215 - 2²⁵ = 822977783 is a prime.

It is a super-3 number, since 3×856532215³ (a number of 28 digits) contains 333 as substring.

It is a Smith number, since the sum of its digits (37) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

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 31 ways as a sum of consecutive naturals, for example, 391996 + ... + 394174.

It is an arithmetic number, because the mean of its divisors is an integer number (40103280).

Almost surely, 2^856532215 is an apocalyptic number.

856532215 is a deficient number, since it is larger than the sum of its proper divisors (426772745).

856532215 is a wasteful number, since it uses less digits than its factorization.

856532215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3223.

The product of its digits is 72000, while the sum is 37.

The square root of 856532215 is about 29266.5716304455. The cubic root of 856532215 is about 949.6886200190.

The spelling of 856532215 in words is "eight hundred fifty-six million, five hundred thirty-two thousand, two hundred fifteen".