684099 has 16 divisors (see below), whose sum is σ = 1092000. Its totient is φ = 420768.

The previous prime is 684091. The next prime is 684109. The reversal of 684099 is 990486.

It is not a de Polignac number, because 684099 - 2³ = 684091 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (684091) 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, 624 + ... + 1325.

It is an arithmetic number, because the mean of its divisors is an integer number (68250).

2⁶⁸⁴⁰⁹⁹ is an apocalyptic number.

684099 is a deficient number, since it is larger than the sum of its proper divisors (407901).

684099 is a wasteful number, since it uses less digits than its factorization.

684099 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1971 (or 1965 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 36.

The square root of 684099 is about 827.1027747505. The cubic root of 684099 is about 88.1129318015.

The spelling of 684099 in words is "six hundred eighty-four thousand, ninety-nine".