684434121 has 16 divisors (see below), whose sum is σ = 1049595264. Its totient is φ = 388612224.

The previous prime is 684434083. The next prime is 684434123. The reversal of 684434121 is 121434486.

It is not a de Polignac number, because 684434121 - 2¹⁸ = 684171977 is a prime.

It is not an unprimeable number, because it can be changed into a prime (684434123) 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, 100500 + ... + 107093.

It is an arithmetic number, because the mean of its divisors is an integer number (65599704).

Almost surely, 2^684434121 is an apocalyptic number.

It is an amenable number.

684434121 is a deficient number, since it is larger than the sum of its proper divisors (365161143).

684434121 is a wasteful number, since it uses less digits than its factorization.

684434121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 207760.

The product of its digits is 18432, while the sum is 33.

The square root of 684434121 is about 26161.6918604283. The cubic root of 684434121 is about 881.2731747439.

The spelling of 684434121 in words is "six hundred eighty-four million, four hundred thirty-four thousand, one hundred twenty-one".