684381398 has 8 divisors (see below), whose sum is σ = 1028248608. Its totient is φ = 341631864.

The previous prime is 684381361. The next prime is 684381403. The reversal of 684381398 is 893183486.

684381398 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 277886 + ... + 280337.

It is an arithmetic number, because the mean of its divisors is an integer number (128531076).

Almost surely, 2^684381398 is an apocalyptic number.

684381398 is a deficient number, since it is larger than the sum of its proper divisors (343867210).

684381398 is a wasteful number, since it uses less digits than its factorization.

684381398 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 558838.

The product of its digits is 995328, while the sum is 50.

The square root of 684381398 is about 26160.6842035907. The cubic root of 684381398 is about 881.2505455591.

The spelling of 684381398 in words is "six hundred eighty-four million, three hundred eighty-one thousand, three hundred ninety-eight".