1673405 has 4 divisors (see below), whose sum is σ = 2008092. Its totient is φ = 1338720.

The previous prime is 1673401. The next prime is 1673407. The reversal of 1673405 is 5043761.

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 502681 + 1170724 = 709^2 + 1082^2 .

It is not a de Polignac number, because 1673405 - 2² = 1673401 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1673401) 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, 167336 + ... + 167345.

It is an arithmetic number, because the mean of its divisors is an integer number (502023).

2^1673405 is an apocalyptic number.

It is an amenable number.

1673405 is a deficient number, since it is larger than the sum of its proper divisors (334687).

1673405 is an equidigital number, since it uses as much as digits as its factorization.

1673405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 334686.

The product of its (nonzero) digits is 2520, while the sum is 26.

The square root of 1673405 is about 1293.6015615328. The cubic root of 1673405 is about 118.7226788485.

The spelling of 1673405 in words is "one million, six hundred seventy-three thousand, four hundred five".