1355905 has 4 divisors (see below), whose sum is σ = 1627092. Its totient is φ = 1084720.

The previous prime is 1355891. The next prime is 1355917. The reversal of 1355905 is 5095531.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5095531 = 7 ⋅727933.

It can be written as a sum of positive squares in 2 ways, for example, as 824464 + 531441 = 908^2 + 729^2 .

It is not a de Polignac number, because 1355905 - 2⁷ = 1355777 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 135586 + ... + 135595.

It is an arithmetic number, because the mean of its divisors is an integer number (406773).

2^1355905 is an apocalyptic number.

It is an amenable number.

1355905 is a deficient number, since it is larger than the sum of its proper divisors (271187).

1355905 is an equidigital number, since it uses as much as digits as its factorization.

1355905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 271186.

The product of its (nonzero) digits is 3375, while the sum is 28.

The square root of 1355905 is about 1164.4333385815. The cubic root of 1355905 is about 110.6818528457.

The spelling of 1355905 in words is "one million, three hundred fifty-five thousand, nine hundred five".