684242 has 8 divisors (see below), whose sum is σ = 1105356. Its totient is φ = 315792.

The previous prime is 684239. The next prime is 684269. The reversal of 684242 is 242486.

684242 is nontrivially palindromic in base 12.

It can be written as a sum of positive squares in 2 ways, for example, as 674041 + 10201 = 821^2 + 101^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×684242² = 936374229128, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (26), and also a Moran number because the ratio is a prime number: 26317 = 684242 / (6 + 8 + 4 + 2 + 4 + 2).

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 684242.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13133 + ... + 13184.

2⁶⁸⁴²⁴² is an apocalyptic number.

684242 is a deficient number, since it is larger than the sum of its proper divisors (421114).

684242 is a wasteful number, since it uses less digits than its factorization.

684242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26332.

The product of its digits is 3072, while the sum is 26.

The square root of 684242 is about 827.1892165641. The cubic root of 684242 is about 88.1190709087.

It can be divided in two parts, 6 and 84242, that added together give a palindrome (84248).

The spelling of 684242 in words is "six hundred eighty-four thousand, two hundred forty-two".