684485039 has 4 divisors (see below), whose sum is σ = 782268624. Its totient is φ = 586701456.

The previous prime is 684485029. The next prime is 684485041. The reversal of 684485039 is 930584486.

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

It is a cyclic number.

It is not a de Polignac number, because 684485039 - 2⁴ = 684485023 is a prime.

It is a super-2 number, since 2×684485039² = 937039537229663042, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 684484984 and 684485002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (684485029) 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, 48891782 + ... + 48891795.

It is an arithmetic number, because the mean of its divisors is an integer number (195567156).

Almost surely, 2^684485039 is an apocalyptic number.

684485039 is a deficient number, since it is larger than the sum of its proper divisors (97783585).

684485039 is an equidigital number, since it uses as much as digits as its factorization.

684485039 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97783584.

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

The square root of 684485039 is about 26162.6649827574. The cubic root of 684485039 is about 881.2950281035.

The spelling of 684485039 in words is "six hundred eighty-four million, four hundred eighty-five thousand, thirty-nine".