684345 has 16 divisors (see below), whose sum is σ = 1121472. Its totient is φ = 356160.

The previous prime is 684337. The next prime is 684347. The reversal of 684345 is 543486.

684345 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 684345 - 2³ = 684337 is a prime.

It is not an unprimeable number, because it can be changed into a prime (684347) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 115 + ... + 1175.

It is an arithmetic number, because the mean of its divisors is an integer number (70092).

2⁶⁸⁴³⁴⁵ is an apocalyptic number.

It is an amenable number.

684345 is a deficient number, since it is larger than the sum of its proper divisors (437127).

684345 is a wasteful number, since it uses less digits than its factorization.

684345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1112.

The product of its digits is 11520, while the sum is 30.

The square root of 684345 is about 827.2514732534. The cubic root of 684345 is about 88.1234922533.

The spelling of 684345 in words is "six hundred eighty-four thousand, three hundred forty-five".