681402 has 8 divisors (see below), whose sum is σ = 1362816. Its totient is φ = 227132.

The previous prime is 681371. The next prime is 681403. The reversal of 681402 is 204186.

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

681402 is an admirable number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 681402.

It is not an unprimeable number, because it can be changed into a prime (681403) by changing a digit.

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, 56778 + ... + 56789.

It is an arithmetic number, because the mean of its divisors is an integer number (170352).

2⁶⁸¹⁴⁰² is an apocalyptic number.

681402 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

681402 is a wasteful number, since it uses less digits than its factorization.

681402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 113572.

The product of its (nonzero) digits is 384, while the sum is 21.

The square root of 681402 is about 825.4707747704. The cubic root of 681402 is about 87.9969868114.

Adding to 681402 its reverse (204186), we get a palindrome (885588).

The spelling of 681402 in words is "six hundred eighty-one thousand, four hundred two".