681418 has 4 divisors (see below), whose sum is σ = 1022130. Its totient is φ = 340708.

The previous prime is 681409. The next prime is 681419. The reversal of 681418 is 814186.

681418 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 660969 + 20449 = 813^2 + 143^2 .

It is not an unprimeable number, because it can be changed into a prime (681419) by changing a digit.

681418 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 as a sum of consecutive naturals, namely, 170353 + ... + 170356.

2⁶⁸¹⁴¹⁸ is an apocalyptic number.

681418 is a deficient number, since it is larger than the sum of its proper divisors (340712).

681418 is a wasteful number, since it uses less digits than its factorization.

681418 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 340711.

The product of its digits is 1536, while the sum is 28.

The square root of 681418 is about 825.4804661529. The cubic root of 681418 is about 87.9976755584.

The spelling of 681418 in words is "six hundred eighty-one thousand, four hundred eighteen".