684431 has 8 divisors (see below), whose sum is σ = 764544. Its totient is φ = 607320.

The previous prime is 684427. The next prime is 684433. The reversal of 684431 is 134486.

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

It is a cyclic number.

It is not a de Polignac number, because 684431 - 2² = 684427 is a prime.

It is a super-2 number, since 2×684431² = 936891587522, 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 684431.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (684433) 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 7 ways as a sum of consecutive naturals, for example, 251 + ... + 1196.

It is an arithmetic number, because the mean of its divisors is an integer number (95568).

2⁶⁸⁴⁴³¹ is an apocalyptic number.

684431 is a deficient number, since it is larger than the sum of its proper divisors (80113).

684431 is a wasteful number, since it uses less digits than its factorization.

684431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1501.

The product of its digits is 2304, while the sum is 26.

The square root of 684431 is about 827.3034509779. The cubic root of 684431 is about 88.1271835215.

Subtracting from 684431 its reverse (134486), we obtain a palindrome (549945).

The spelling of 684431 in words is "six hundred eighty-four thousand, four hundred thirty-one".