684878941 has 4 divisors (see below), whose sum is σ = 692574300. Its totient is φ = 677183584.

The previous prime is 684878927. The next prime is 684878977. The reversal of 684878941 is 149878486.

It is a happy number.

684878941 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in 2 ways, for example, as 109118916 + 575760025 = 10446^2 + 23995^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-684878941 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 (684878911) 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, 3847546 + ... + 3847723.

It is an arithmetic number, because the mean of its divisors is an integer number (173143575).

Almost surely, 2^684878941 is an apocalyptic number.

It is an amenable number.

684878941 is a deficient number, since it is larger than the sum of its proper divisors (7695359).

684878941 is an equidigital number, since it uses as much as digits as its factorization.

684878941 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7695358.

The product of its digits is 3096576, while the sum is 55.

The square root of 684878941 is about 26170.1918411004. The cubic root of 684878941 is about 881.4640492338.

The spelling of 684878941 in words is "six hundred eighty-four million, eight hundred seventy-eight thousand, nine hundred forty-one".