816227999 has 8 divisors (see below), whose sum is σ = 828727200. Its totient is φ = 803756800.

The previous prime is 816227981. The next prime is 816228019. The reversal of 816227999 is 999722618.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-816227999 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 816227999.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (816223999) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 56027 + ... + 69075.

It is an arithmetic number, because the mean of its divisors is an integer number (103590900).

Almost surely, 2^816227999 is an apocalyptic number.

816227999 is a deficient number, since it is larger than the sum of its proper divisors (12499201).

816227999 is a wasteful number, since it uses less digits than its factorization.

816227999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14001.

The product of its digits is 979776, while the sum is 53.

The square root of 816227999 is about 28569.7042161798. The cubic root of 816227999 is about 934.5527707589.

The spelling of 816227999 in words is "eight hundred sixteen million, two hundred twenty-seven thousand, nine hundred ninety-nine".