684069 has 4 divisors (see below), whose sum is σ = 912096. Its totient is φ = 456044.

The previous prime is 684053. The next prime is 684091. The reversal of 684069 is 960486.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 684069 - 2⁴ = 684053 is a prime.

It is a super-2 number, since 2×684069² = 935900793522, which contains 22 as substring.

It is a D-number.

684069 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (684269) 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, 114009 + ... + 114014.

It is an arithmetic number, because the mean of its divisors is an integer number (228024).

2⁶⁸⁴⁰⁶⁹ is an apocalyptic number.

It is an amenable number.

684069 is a deficient number, since it is larger than the sum of its proper divisors (228027).

684069 is a wasteful number, since it uses less digits than its factorization.

684069 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 228026.

The product of its (nonzero) digits is 10368, while the sum is 33.

The square root of 684069 is about 827.0846389578. The cubic root of 684069 is about 88.1116437683. Note that the first 3 decimals are identical.

The spelling of 684069 in words is "six hundred eighty-four thousand, sixty-nine".