806221215 has 16 divisors (see below), whose sum is σ = 1433282400. Its totient is φ = 429984576.

The previous prime is 806221211. The next prime is 806221261. The reversal of 806221215 is 512122608.

It is a happy number.

It is not a de Polignac number, because 806221215 - 2² = 806221211 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (806221211) by changing a digit.

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, 2985870 + ... + 2986139.

It is an arithmetic number, because the mean of its divisors is an integer number (89580150).

Almost surely, 2^806221215 is an apocalyptic number.

806221215 is a deficient number, since it is larger than the sum of its proper divisors (627061185).

806221215 is a wasteful number, since it uses less digits than its factorization.

806221215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5972023 (or 5972017 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 27.

The square root of 806221215 is about 28394.0348488904. The cubic root of 806221215 is about 930.7179160036.

The spelling of 806221215 in words is "eight hundred six million, two hundred twenty-one thousand, two hundred fifteen".