816819837 has 8 divisors (see below), whose sum is σ = 1124225280. Its totient is φ = 526980480.

The previous prime is 816819797. The next prime is 816819841. The reversal of 816819837 is 738918618.

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

It is not a de Polignac number, because 816819837 - 2⁸ = 816819581 is a prime.

It is a super-2 number, since 2×816819837² = 1334389292233413138, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 816819837.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (816819037) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 4391412 + ... + 4391597.

It is an arithmetic number, because the mean of its divisors is an integer number (140528160).

Almost surely, 2^816819837 is an apocalyptic number.

It is an amenable number.

816819837 is a deficient number, since it is larger than the sum of its proper divisors (307405443).

816819837 is a wasteful number, since it uses less digits than its factorization.

816819837 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8783043.

The product of its digits is 580608, while the sum is 51.

The square root of 816819837 is about 28580.0601293979. The cubic root of 816819837 is about 934.7785941866.

The spelling of 816819837 in words is "eight hundred sixteen million, eight hundred nineteen thousand, eight hundred thirty-seven".