681405 has 8 divisors (see below), whose sum is σ = 1090272. Its totient is φ = 363408.

The previous prime is 681403. The next prime is 681407. The reversal of 681405 is 504186.

It is an interprime number because it is at equal distance from previous prime (681403) and next prime (681407).

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

It is not a de Polignac number, because 681405 - 2¹ = 681403 is a prime.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 681405.

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

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22699 + ... + 22728.

It is an arithmetic number, because the mean of its divisors is an integer number (136284).

2⁶⁸¹⁴⁰⁵ is an apocalyptic number.

It is an amenable number.

681405 is a deficient number, since it is larger than the sum of its proper divisors (408867).

681405 is a wasteful number, since it uses less digits than its factorization.

681405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45435.

The product of its (nonzero) digits is 960, while the sum is 24.

The square root of 681405 is about 825.4725919133. The cubic root of 681405 is about 87.9971159523.

The spelling of 681405 in words is "six hundred eighty-one thousand, four hundred five".