818434840 has 16 divisors (see below), whose sum is σ = 1841478480. Its totient is φ = 327373920.

The previous prime is 818434811. The next prime is 818434873. The reversal of 818434840 is 48434818.

It is a Harshad number since it is a multiple of its sum of digits (40), and also a Moran number because the ratio is a prime number: 20460871 = 818434840 / (8 + 1 + 8 + 4 + 3 + 4 + 8 + 4 + 0).

It is a junction number, because it is equal to n+sod(n) for n = 818434793 and 818434802.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 10230396 + ... + 10230475.

It is an arithmetic number, because the mean of its divisors is an integer number (115092405).

Almost surely, 2^818434840 is an apocalyptic number.

It is an amenable number.

818434840 is an abundant number, since it is smaller than the sum of its proper divisors (1023043640).

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

818434840 is a wasteful number, since it uses less digits than its factorization.

818434840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20460882 (or 20460878 counting only the distinct ones).

The product of its (nonzero) digits is 98304, while the sum is 40.

The square root of 818434840 is about 28608.3001941744. The cubic root of 818434840 is about 935.3942649836.

The spelling of 818434840 in words is "eight hundred eighteen million, four hundred thirty-four thousand, eight hundred forty".