1405523 has 4 divisors (see below), whose sum is σ = 1606320. Its totient is φ = 1204728.

The previous prime is 1405513. The next prime is 1405529. The reversal of 1405523 is 3255041.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3255041 = 17 ⋅191473.

It is not a de Polignac number, because 1405523 - 2⁸ = 1405267 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1405495 and 1405504.

It is not an unprimeable number, because it can be changed into a prime (1405529) 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, 100388 + ... + 100401.

It is an arithmetic number, because the mean of its divisors is an integer number (401580).

2^1405523 is an apocalyptic number.

1405523 is a deficient number, since it is larger than the sum of its proper divisors (200797).

1405523 is an equidigital number, since it uses as much as digits as its factorization.

1405523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 200796.

The product of its (nonzero) digits is 600, while the sum is 20.

The square root of 1405523 is about 1185.5475528211. The cubic root of 1405523 is about 112.0158087804.

The spelling of 1405523 in words is "one million, four hundred five thousand, five hundred twenty-three".