684738 has 24 divisors (see below), whose sum is σ = 1501500. Its totient is φ = 225504.

The previous prime is 684731. The next prime is 684751. The reversal of 684738 is 837486.

It can be written as a sum of positive squares in 2 ways, for example, as 651249 + 33489 = 807^2 + 183^2 .

It is a super-2 number, since 2×684738² = 937732257288, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (684731) by changing a digit.

684738 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 11 ways as a sum of consecutive naturals, for example, 1788 + ... + 2136.

2⁶⁸⁴⁷³⁸ is an apocalyptic number.

684738 is an abundant number, since it is smaller than the sum of its proper divisors (816762).

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

684738 is a wasteful number, since it uses less digits than its factorization.

684738 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 466 (or 463 counting only the distinct ones).

The product of its digits is 32256, while the sum is 36.

The square root of 684738 is about 827.4889727362. The cubic root of 684738 is about 88.1403579692.

The spelling of 684738 in words is "six hundred eighty-four thousand, seven hundred thirty-eight".