786645 has 16 divisors (see below), whose sum is σ = 1398720. Its totient is φ = 419472.

The previous prime is 786629. The next prime is 786659. The reversal of 786645 is 546687.

It is a happy number.

786645 is a `hidden beast` number, since 7 + 8 + 6 + 645 = 666.

It is not a de Polignac number, because 786645 - 2⁴ = 786629 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2779 + ... + 3048.

It is an arithmetic number, because the mean of its divisors is an integer number (87420).

2⁷⁸⁶⁶⁴⁵ is an apocalyptic number.

It is an amenable number.

786645 is a deficient number, since it is larger than the sum of its proper divisors (612075).

786645 is a wasteful number, since it uses less digits than its factorization.

786645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5841 (or 5835 counting only the distinct ones).

The product of its digits is 40320, while the sum is 36.

The square root of 786645 is about 886.9300987113. The cubic root of 786645 is about 92.3123050580.

It can be divided in two parts, 786 and 645, that added together give a triangular number (1431 = T₅₃).

The spelling of 786645 in words is "seven hundred eighty-six thousand, six hundred forty-five".