681442 has 16 divisors (see below), whose sum is σ = 1094400. Its totient is φ = 317520.

The previous prime is 681427. The next prime is 681449. The reversal of 681442 is 244186.

681442 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (681449) by changing a digit.

681442 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, 1609 + ... + 1987.

It is an arithmetic number, because the mean of its divisors is an integer number (68400).

2⁶⁸¹⁴⁴² is an apocalyptic number.

681442 is a gapful number since it is divisible by the number (62) formed by its first and last digit.

681442 is a deficient number, since it is larger than the sum of its proper divisors (412958).

681442 is a wasteful number, since it uses less digits than its factorization.

681442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 441.

The product of its digits is 1536, while the sum is 25.

The square root of 681442 is about 825.4950030133. The cubic root of 681442 is about 87.9987086587.

The spelling of 681442 in words is "six hundred eighty-one thousand, four hundred forty-two".