684889199 has 4 divisors (see below), whose sum is σ = 684962664. Its totient is φ = 684815736.

The previous prime is 684889189. The next prime is 684889207. The reversal of 684889199 is 991988486.

684889199 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 684889199 - 2¹⁶ = 684823663 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (684889159) 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, 20297 + ... + 42210.

It is an arithmetic number, because the mean of its divisors is an integer number (171240666).

Almost surely, 2^684889199 is an apocalyptic number.

684889199 is a deficient number, since it is larger than the sum of its proper divisors (73465).

684889199 is a wasteful number, since it uses less digits than its factorization.

684889199 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73464.

The product of its digits is 8957952, while the sum is 62.

The square root of 684889199 is about 26170.3878267021. The cubic root of 684889199 is about 881.4684500179.

The spelling of 684889199 in words is "six hundred eighty-four million, eight hundred eighty-nine thousand, one hundred ninety-nine".