684969 has 16 divisors (see below), whose sum is σ = 982080. Its totient is φ = 423360.

The previous prime is 684961. The next prime is 684973. The reversal of 684969 is 969486.

It is not a de Polignac number, because 684969 - 2³ = 684961 is a prime.

It is a super-2 number, since 2×684969² = 938365061922, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 684969.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 684969.

It is not an unprimeable number, because it can be changed into a prime (684961) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 3379 + ... + 3575.

It is an arithmetic number, because the mean of its divisors is an integer number (61380).

2⁶⁸⁴⁹⁶⁹ is an apocalyptic number.

It is an amenable number.

684969 is a deficient number, since it is larger than the sum of its proper divisors (297111).

684969 is a wasteful number, since it uses less digits than its factorization.

684969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 280.

The product of its digits is 93312, while the sum is 42.

The square root of 684969 is about 827.6285398656. The cubic root of 684969 is about 88.1502683941.

It can be divided in two parts, 684 and 969, that added together give a triangular number (1653 = T₅₇).

The spelling of 684969 in words is "six hundred eighty-four thousand, nine hundred sixty-nine".