684242939 has 8 divisors (see below), whose sum is σ = 714292992. Its totient is φ = 654217960.

The previous prime is 684242903. The next prime is 684242941. The reversal of 684242939 is 939242486.

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 684242939 - 2⁸ = 684242683 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 684242893 and 684242902.

It is not an unprimeable number, because it can be changed into a prime (684242959) 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, 68732 + ... + 78054.

It is an arithmetic number, because the mean of its divisors is an integer number (89286624).

Almost surely, 2^684242939 is an apocalyptic number.

684242939 is a deficient number, since it is larger than the sum of its proper divisors (30050053).

684242939 is a wasteful number, since it uses less digits than its factorization.

684242939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12537.

The product of its digits is 746496, while the sum is 47.

The square root of 684242939 is about 26158.0377513299. The cubic root of 684242939 is about 881.1911121792.

The spelling of 684242939 in words is "six hundred eighty-four million, two hundred forty-two thousand, nine hundred thirty-nine".