673405 has 4 divisors (see below), whose sum is σ = 808092. Its totient is φ = 538720.

The previous prime is 673403. The next prime is 673411. The reversal of 673405 is 504376.

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

It can be written as a sum of positive squares in 2 ways, for example, as 68121 + 605284 = 261^2 + 778^2 .

It is not a de Polignac number, because 673405 - 2¹ = 673403 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 673405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (673403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 67336 + ... + 67345.

It is an arithmetic number, because the mean of its divisors is an integer number (202023).

2⁶⁷³⁴⁰⁵ is an apocalyptic number.

It is an amenable number.

673405 is a deficient number, since it is larger than the sum of its proper divisors (134687).

673405 is a wasteful number, since it uses less digits than its factorization.

673405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134686.

The product of its (nonzero) digits is 2520, while the sum is 25.

The square root of 673405 is about 820.6125760674. The cubic root of 673405 is about 87.6513841969.

Subtracting from 673405 its sum of digits (25), we obtain a triangular number (673380 = T₁₁₆₀).

The spelling of 673405 in words is "six hundred seventy-three thousand, four hundred five".