684403543 has 4 divisors (see below), whose sum is σ = 693779008. Its totient is φ = 675028080.

The previous prime is 684403537. The next prime is 684403607. The reversal of 684403543 is 345304486.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 345304486 = 2 ⋅172652243.

It is not a de Polignac number, because 684403543 - 2¹³ = 684395351 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 (684407543) 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, 4687623 + ... + 4687768.

It is an arithmetic number, because the mean of its divisors is an integer number (173444752).

Almost surely, 2^684403543 is an apocalyptic number.

684403543 is a deficient number, since it is larger than the sum of its proper divisors (9375465).

684403543 is an equidigital number, since it uses as much as digits as its factorization.

684403543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9375464.

The product of its (nonzero) digits is 138240, while the sum is 37.

The square root of 684403543 is about 26161.1074498004. The cubic root of 684403543 is about 881.2600505334.

The spelling of 684403543 in words is "six hundred eighty-four million, four hundred three thousand, five hundred forty-three".