1353805 has 4 divisors (see below), whose sum is σ = 1624572. Its totient is φ = 1083040.

The previous prime is 1353791. The next prime is 1353809. The reversal of 1353805 is 5083531.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5083531 = 113 ⋅44987.

It can be written as a sum of positive squares in 2 ways, for example, as 1042441 + 311364 = 1021^2 + 558^2 .

It is not a de Polignac number, because 1353805 - 2⁹ = 1353293 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 1353805.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1353809) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 135376 + ... + 135385.

It is an arithmetic number, because the mean of its divisors is an integer number (406143).

2^1353805 is an apocalyptic number.

It is an amenable number.

1353805 is a deficient number, since it is larger than the sum of its proper divisors (270767).

1353805 is an equidigital number, since it uses as much as digits as its factorization.

1353805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 270766.

The product of its (nonzero) digits is 1800, while the sum is 25.

The square root of 1353805 is about 1163.5312630093. The cubic root of 1353805 is about 110.6246826680.

The spelling of 1353805 in words is "one million, three hundred fifty-three thousand, eight hundred five".