684011 has 4 divisors (see below), whose sum is σ = 686712. Its totient is φ = 681312.

The previous prime is 684007. The next prime is 684017. The reversal of 684011 is 110486.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 110486 = 2 ⋅55243.

It is a cyclic number.

It is not a de Polignac number, because 684011 - 2² = 684007 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (684017) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 926 + ... + 1491.

It is an arithmetic number, because the mean of its divisors is an integer number (171678).

2⁶⁸⁴⁰¹¹ is an apocalyptic number.

684011 is a deficient number, since it is larger than the sum of its proper divisors (2701).

684011 is a wasteful number, since it uses less digits than its factorization.

684011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2700.

The product of its (nonzero) digits is 192, while the sum is 20.

The square root of 684011 is about 827.0495752976. The cubic root of 684011 is about 88.1091534641.

Adding to 684011 its reverse (110486), we get a palindrome (794497).

The spelling of 684011 in words is "six hundred eighty-four thousand, eleven".