673981 has 8 divisors (see below), whose sum is σ = 840384. Its totient is φ = 525120.

The previous prime is 673979. The next prime is 673991. The reversal of 673981 is 189376.

673981 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 673981 - 2¹ = 673979 is a prime.

It is a super-2 number, since 2×673981² = 908500776722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (673921) 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, 4300 + ... + 4453.

It is an arithmetic number, because the mean of its divisors is an integer number (105048).

2⁶⁷³⁹⁸¹ is an apocalyptic number.

It is an amenable number.

673981 is a deficient number, since it is larger than the sum of its proper divisors (166403).

673981 is a wasteful number, since it uses less digits than its factorization.

673981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8771.

The product of its digits is 9072, while the sum is 34.

The square root of 673981 is about 820.9634583829. The cubic root of 673981 is about 87.6763680770.

The spelling of 673981 in words is "six hundred seventy-three thousand, nine hundred eighty-one".