818985920 has 56 divisors (see below), whose sum is σ = 1952749968. Its totient is φ = 327168000.

The previous prime is 818985877. The next prime is 818985929. The reversal of 818985920 is 29589818.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (818985929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 383255 + ... + 385385.

Almost surely, 2^818985920 is an apocalyptic number.

818985920 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

818985920 is an abundant number, since it is smaller than the sum of its proper divisors (1133764048).

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

818985920 is a wasteful number, since it uses less digits than its factorization.

818985920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3349 (or 3339 counting only the distinct ones).

The product of its (nonzero) digits is 414720, while the sum is 50.

The square root of 818985920 is about 28617.9300439427. The cubic root of 818985920 is about 935.6041621326.

The spelling of 818985920 in words is "eight hundred eighteen million, nine hundred eighty-five thousand, nine hundred twenty".