684469817 has 4 divisors (see below), whose sum is σ = 685842000. Its totient is φ = 683097636.

The previous prime is 684469787. The next prime is 684469823. The reversal of 684469817 is 718964486.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 718964486 = 2 ⋅359482243.

It is a cyclic number.

It is not a de Polignac number, because 684469817 - 2¹⁸ = 684207673 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (684469847) 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, 685343 + ... + 686340.

It is an arithmetic number, because the mean of its divisors is an integer number (171460500).

Almost surely, 2^684469817 is an apocalyptic number.

It is an amenable number.

684469817 is a deficient number, since it is larger than the sum of its proper divisors (1372183).

684469817 is a wasteful number, since it uses less digits than its factorization.

684469817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1372182.

The product of its digits is 2322432, while the sum is 53.

The square root of 684469817 is about 26162.3740704088. The cubic root of 684469817 is about 881.2884951278.

The spelling of 684469817 in words is "six hundred eighty-four million, four hundred sixty-nine thousand, eight hundred seventeen".