818439816 has 32 divisors (see below), whose sum is σ = 2062218240. Its totient is φ = 270664128.

The previous prime is 818439803. The next prime is 818439829. The reversal of 818439816 is 618934818.

It is an interprime number because it is at equal distance from previous prime (818439803) and next prime (818439829).

It is a super-2 number, since 2×818439816² = 1339687464828227712, which contains 22 as substring.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 131211 + ... + 137306.

It is an arithmetic number, because the mean of its divisors is an integer number (64444320).

Almost surely, 2^818439816 is an apocalyptic number.

It is an amenable number.

818439816 is an abundant number, since it is smaller than the sum of its proper divisors (1243778424).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

818439816 is a wasteful number, since it uses less digits than its factorization.

818439816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 268653 (or 268649 counting only the distinct ones).

The product of its digits is 331776, while the sum is 48.

The square root of 818439816 is about 28608.3871618097. The cubic root of 818439816 is about 935.3961606802.

The spelling of 818439816 in words is "eight hundred eighteen million, four hundred thirty-nine thousand, eight hundred sixteen".