818944240 has 20 divisors (see below), whose sum is σ = 1904045544. Its totient is φ = 327577664.

The previous prime is 818944229. The next prime is 818944241. The reversal of 818944240 is 42449818.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (20).

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 818944193 and 818944202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (818944241) by changing a digit.

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, 5118322 + ... + 5118481.

Almost surely, 2^818944240 is an apocalyptic number.

818944240 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

818944240 is an abundant number, since it is smaller than the sum of its proper divisors (1085101304).

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

818944240 is a wasteful number, since it uses less digits than its factorization.

818944240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10236816 (or 10236810 counting only the distinct ones).

The product of its (nonzero) digits is 73728, while the sum is 40.

The square root of 818944240 is about 28617.2018198845. The cubic root of 818944240 is about 935.5882902102.

The spelling of 818944240 in words is "eight hundred eighteen million, nine hundred forty-four thousand, two hundred forty".