813991380 has 24 divisors (see below), whose sum is σ = 2279176032. Its totient is φ = 217064352.

The previous prime is 813991349. The next prime is 813991393. The reversal of 813991380 is 83199318.

It is a happy number.

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 7 ways as a sum of consecutive naturals, for example, 6783202 + ... + 6783321.

It is an arithmetic number, because the mean of its divisors is an integer number (94965668).

Almost surely, 2^813991380 is an apocalyptic number.

It is an amenable number.

813991380 is an abundant number, since it is smaller than the sum of its proper divisors (1465184652).

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

813991380 is a wasteful number, since it uses less digits than its factorization.

813991380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13566535 (or 13566533 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 42.

The square root of 813991380 is about 28530.5341695525. The cubic root of 813991380 is about 933.6983727990.

The spelling of 813991380 in words is "eight hundred thirteen million, nine hundred ninety-one thousand, three hundred eighty".