684138373 has 4 divisors (see below), whose sum is σ = 692381088. Its totient is φ = 675895660.

The previous prime is 684138359. The next prime is 684138383. The reversal of 684138373 is 373831486.

684138373 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, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 684138373 - 2¹⁷ = 684007301 is a prime.

It is a super-2 number, since 2×684138373² = 936090626822174258, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (684138353) 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, 4121233 + ... + 4121398.

It is an arithmetic number, because the mean of its divisors is an integer number (173095272).

Almost surely, 2^684138373 is an apocalyptic number.

It is an amenable number.

684138373 is a deficient number, since it is larger than the sum of its proper divisors (8242715).

684138373 is an equidigital number, since it uses as much as digits as its factorization.

684138373 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8242714.

The product of its digits is 290304, while the sum is 43.

The square root of 684138373 is about 26156.0389394113. The cubic root of 684138373 is about 881.1462220197.

The spelling of 684138373 in words is "six hundred eighty-four million, one hundred thirty-eight thousand, three hundred seventy-three".