813666940 has 24 divisors (see below), whose sum is σ = 1712410560. Its totient is φ = 324760128.

The previous prime is 813666907. The next prime is 813666991. The reversal of 813666940 is 49666318.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34675 + ... + 53194.

It is an arithmetic number, because the mean of its divisors is an integer number (71350440).

Almost surely, 2^813666940 is an apocalyptic number.

It is an amenable number.

813666940 is an abundant number, since it is smaller than the sum of its proper divisors (898743620).

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

813666940 is a wasteful number, since it uses less digits than its factorization.

813666940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88341 (or 88339 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 43.

The square root of 813666940 is about 28524.8477647121. The cubic root of 813666940 is about 933.5743054098.

It can be divided in two parts, 8136 and 66940, that added together give a square (75076 = 274²).

The spelling of 813666940 in words is "eight hundred thirteen million, six hundred sixty-six thousand, nine hundred forty".