681426 has 16 divisors (see below), whose sum is σ = 1514400. Its totient is φ = 227124.

The previous prime is 681419. The next prime is 681427. The reversal of 681426 is 624186.

681426 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a self number, because there is not a number n which added to its sum of digits gives 681426.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 681426.

It is not an unprimeable number, because it can be changed into a prime (681427) by changing a digit.

681426 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6256 + ... + 6363.

It is an arithmetic number, because the mean of its divisors is an integer number (94650).

2⁶⁸¹⁴²⁶ is an apocalyptic number.

681426 is an abundant number, since it is smaller than the sum of its proper divisors (832974).

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

681426 is a wasteful number, since it uses less digits than its factorization.

681426 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12630 (or 12624 counting only the distinct ones).

The product of its digits is 2304, while the sum is 27.

The square root of 681426 is about 825.4853118015. The cubic root of 681426 is about 87.9980199279.

The spelling of 681426 in words is "six hundred eighty-one thousand, four hundred twenty-six".