684438143 has 4 divisors (see below), whose sum is σ = 684886728. Its totient is φ = 683989560.

The previous prime is 684438137. The next prime is 684438149. The reversal of 684438143 is 341834486.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (684438137) and next prime (684438149).

It is not a de Polignac number, because 684438143 - 2²⁴ = 667660927 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 684438143.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (684438149) 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, 221996 + ... + 225057.

It is an arithmetic number, because the mean of its divisors is an integer number (171221682).

Almost surely, 2^684438143 is an apocalyptic number.

684438143 is a deficient number, since it is larger than the sum of its proper divisors (448585).

684438143 is a wasteful number, since it uses less digits than its factorization.

684438143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 448584.

The product of its digits is 221184, while the sum is 41.

The square root of 684438143 is about 26161.7687284327. The cubic root of 684438143 is about 881.2749009747.

The spelling of 684438143 in words is "six hundred eighty-four million, four hundred thirty-eight thousand, one hundred forty-three".