863780 has 12 divisors (see below), whose sum is σ = 1813980. Its totient is φ = 345504.

The previous prime is 863771. The next prime is 863783. The reversal of 863780 is 87368.

It can be written as a sum of positive squares in 2 ways, for example, as 131044 + 732736 = 362^2 + 856^2 .

It is a super-2 number, since 2×863780² = 1492231776800, which contains 22 as substring.

It is a hoax number, since the sum of its digits (32) coincides with the sum of the digits of its distinct prime factors.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 863780.

It is not an unprimeable number, because it can be changed into a prime (863783) by changing a digit.

863780 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21575 + ... + 21614.

It is an arithmetic number, because the mean of its divisors is an integer number (151165).

2⁸⁶³⁷⁸⁰ is an apocalyptic number.

It is an amenable number.

863780 is an abundant number, since it is smaller than the sum of its proper divisors (950200).

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

863780 is a wasteful number, since it uses less digits than its factorization.

863780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43198 (or 43196 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 32.

The square root of 863780 is about 929.3976543977. The cubic root of 863780 is about 95.2359784450.

The spelling of 863780 in words is "eight hundred sixty-three thousand, seven hundred eighty".