684809453 has 8 divisors (see below), whose sum is σ = 728105400. Its totient is φ = 641848320.

The previous prime is 684809399. The next prime is 684809459. The reversal of 684809453 is 354908486.

It can be written as a sum of positive squares in 4 ways, for example, as 77827684 + 606981769 = 8822^2 + 24637^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 684809453 - 2⁸ = 684809197 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 684809398 and 684809407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (684809459) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 79478 + ... + 87671.

It is an arithmetic number, because the mean of its divisors is an integer number (91013175).

Almost surely, 2^684809453 is an apocalyptic number.

It is an amenable number.

684809453 is a deficient number, since it is larger than the sum of its proper divisors (43295947).

684809453 is a wasteful number, since it uses less digits than its factorization.

684809453 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 167407.

The product of its (nonzero) digits is 829440, while the sum is 47.

The square root of 684809453 is about 26168.8641901019. The cubic root of 684809453 is about 881.4342370330.

The spelling of 684809453 in words is "six hundred eighty-four million, eight hundred nine thousand, four hundred fifty-three".