1405405 has 4 divisors (see below), whose sum is σ = 1686492. Its totient is φ = 1124320.

The previous prime is 1405403. The next prime is 1405421. The reversal of 1405405 is 5045041.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5045041 = 283 ⋅17827.

It can be written as a sum of positive squares in 2 ways, for example, as 611524 + 793881 = 782^2 + 891^2 .

It is not a de Polignac number, because 1405405 - 2¹ = 1405403 is a prime.

It is a Duffinian number.

1405405 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1405403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 140536 + ... + 140545.

It is an arithmetic number, because the mean of its divisors is an integer number (421623).

2^1405405 is an apocalyptic number.

It is an amenable number.

1405405 is a deficient number, since it is larger than the sum of its proper divisors (281087).

1405405 is an equidigital number, since it uses as much as digits as its factorization.

1405405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 281086.

The product of its (nonzero) digits is 400, while the sum is 19.

The square root of 1405405 is about 1185.4977857423. The cubic root of 1405405 is about 112.0126739484.

The spelling of 1405405 in words is "one million, four hundred five thousand, four hundred five".