681398 has 8 divisors (see below), whose sum is σ = 1066608. Its totient is φ = 325864.

The previous prime is 681371. The next prime is 681403. The reversal of 681398 is 893186.

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

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 681398.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7361 + ... + 7452.

It is an arithmetic number, because the mean of its divisors is an integer number (133326).

2⁶⁸¹³⁹⁸ is an apocalyptic number.

681398 is a deficient number, since it is larger than the sum of its proper divisors (385210).

681398 is a wasteful number, since it uses less digits than its factorization.

681398 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14838.

The product of its digits is 10368, while the sum is 35.

The square root of 681398 is about 825.4683519070. The cubic root of 681398 is about 87.9968146230.

The spelling of 681398 in words is "six hundred eighty-one thousand, three hundred ninety-eight".