1423405 has 4 divisors (see below), whose sum is σ = 1708092. Its totient is φ = 1138720.

The previous prime is 1423403. The next prime is 1423417. The reversal of 1423405 is 5043241.

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 736164 + 687241 = 858^2 + 829^2 .

It is not a de Polignac number, because 1423405 - 2¹ = 1423403 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1423403) 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, 142336 + ... + 142345.

It is an arithmetic number, because the mean of its divisors is an integer number (427023).

2^1423405 is an apocalyptic number.

It is an amenable number.

1423405 is a deficient number, since it is larger than the sum of its proper divisors (284687).

1423405 is an equidigital number, since it uses as much as digits as its factorization.

1423405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 284686.

The product of its (nonzero) digits is 480, while the sum is 19.

The square root of 1423405 is about 1193.0653796000. The cubic root of 1423405 is about 112.4888548630.

Adding to 1423405 its reverse (5043241), we get a palindrome (6466646).

The spelling of 1423405 in words is "one million, four hundred twenty-three thousand, four hundred five".