1973605 has 4 divisors (see below), whose sum is σ = 2368332. Its totient is φ = 1578880.

The previous prime is 1973597. The next prime is 1973627. The reversal of 1973605 is 5063791.

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 1406596 + 567009 = 1186^2 + 753^2 .

It is not a de Polignac number, because 1973605 - 2³ = 1973597 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

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, 197356 + ... + 197365.

It is an arithmetic number, because the mean of its divisors is an integer number (592083).

2^1973605 is an apocalyptic number.

It is an amenable number.

1973605 is a deficient number, since it is larger than the sum of its proper divisors (394727).

1973605 is an equidigital number, since it uses as much as digits as its factorization.

1973605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 394726.

The product of its (nonzero) digits is 5670, while the sum is 31.

The square root of 1973605 is about 1404.8505258568. The cubic root of 1973605 is about 125.4353884015.

The spelling of 1973605 in words is "one million, nine hundred seventy-three thousand, six hundred five".