818989844 has 6 divisors (see below), whose sum is σ = 1433232234. Its totient is φ = 409494920.

The previous prime is 818989811. The next prime is 818989849. The reversal of 818989844 is 448989818.

It can be written as a sum of positive squares in only one way, i.e., 817273744 + 1716100 = 28588^2 + 1310^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (818989849) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102373727 + ... + 102373734.

It is an arithmetic number, because the mean of its divisors is an integer number (238872039).

Almost surely, 2^818989844 is an apocalyptic number.

It is an amenable number.

818989844 is a deficient number, since it is larger than the sum of its proper divisors (614242390).

818989844 is a wasteful number, since it uses less digits than its factorization.

818989844 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 204747465 (or 204747463 counting only the distinct ones).

The product of its digits is 5308416, while the sum is 59.

The square root of 818989844 is about 28617.9986022783. The cubic root of 818989844 is about 935.6056563809.

The spelling of 818989844 in words is "eight hundred eighteen million, nine hundred eighty-nine thousand, eight hundred forty-four".