681942 has 8 divisors (see below), whose sum is σ = 1363896. Its totient is φ = 227312.

The previous prime is 681931. The next prime is 681943. The reversal of 681942 is 249186.

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

681942 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681943) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 56823 + ... + 56834.

It is an arithmetic number, because the mean of its divisors is an integer number (170487).

2⁶⁸¹⁹⁴² is an apocalyptic number.

681942 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.

681942 is a wasteful number, since it uses less digits than its factorization.

681942 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113662.

The product of its digits is 3456, while the sum is 30.

The square root of 681942 is about 825.7977960736. The cubic root of 681942 is about 88.0202260671.

The spelling of 681942 in words is "six hundred eighty-one thousand, nine hundred forty-two".