812323215 has 72 divisors (see below), whose sum is σ = 1594499760. Its totient is φ = 392087520.

The previous prime is 812323157. The next prime is 812323219. The reversal of 812323215 is 512323218.

It is not a de Polignac number, because 812323215 - 2¹⁰ = 812322191 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 (812323219) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 3642594 + ... + 3642816.

It is an arithmetic number, because the mean of its divisors is an integer number (22145830).

Almost surely, 2^812323215 is an apocalyptic number.

812323215 is a deficient number, since it is larger than the sum of its proper divisors (782176545).

812323215 is a wasteful number, since it uses less digits than its factorization.

812323215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 482 (or 242 counting only the distinct ones).

The product of its digits is 2880, while the sum is 27.

The square root of 812323215 is about 28501.2844447404. The cubic root of 812323215 is about 933.0601071686.

The spelling of 812323215 in words is "eight hundred twelve million, three hundred twenty-three thousand, two hundred fifteen".