673840 has 20 divisors (see below), whose sum is σ = 1566864. Its totient is φ = 269504.

The previous prime is 673837. The next prime is 673879. The reversal of 673840 is 48376.

It is a tau number, because it is divible by the number of its divisors (20).

It is a junction number, because it is equal to n+sod(n) for n = 673799 and 673808.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4132 + ... + 4291.

2⁶⁷³⁸⁴⁰ is an apocalyptic number.

It is an amenable number.

673840 is an abundant number, since it is smaller than the sum of its proper divisors (893024).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

673840 is a wasteful number, since it uses less digits than its factorization.

673840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8436 (or 8430 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 28.

The square root of 673840 is about 820.8775791797. The cubic root of 673840 is about 87.6702535475.

The spelling of 673840 in words is "six hundred seventy-three thousand, eight hundred forty".