813980 has 12 divisors (see below), whose sum is σ = 1709400. Its totient is φ = 325584.

The previous prime is 813971. The next prime is 813991. The reversal of 813980 is 89318.

It is a happy number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 813980.

It is an unprimeable number.

813980 is an untouchable number, because it is not equal to the sum of proper divisors of any 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 3 ways as a sum of consecutive naturals, for example, 20330 + ... + 20369.

It is an arithmetic number, because the mean of its divisors is an integer number (142450).

2⁸¹³⁹⁸⁰ is an apocalyptic number.

It is an amenable number.

813980 is an abundant number, since it is smaller than the sum of its proper divisors (895420).

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

813980 is a wasteful number, since it uses less digits than its factorization.

813980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40708 (or 40706 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 29.

The square root of 813980 is about 902.2084016457. The cubic root of 813980 is about 93.3694021591.

The spelling of 813980 in words is "eight hundred thirteen thousand, nine hundred eighty".