1623423 has 4 divisors (see below), whose sum is σ = 2164568. Its totient is φ = 1082280.

The previous prime is 1623421. The next prime is 1623431. The reversal of 1623423 is 3243261.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 1623423 - 2¹ = 1623421 is a prime.

It is a D-number.

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 1623423.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1623421) 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, 270568 + ... + 270573.

It is an arithmetic number, because the mean of its divisors is an integer number (541142).

2^1623423 is an apocalyptic number.

1623423 is a deficient number, since it is larger than the sum of its proper divisors (541145).

1623423 is an equidigital number, since it uses as much as digits as its factorization.

1623423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 541144.

The product of its digits is 864, while the sum is 21.

The square root of 1623423 is about 1274.1361779653. The cubic root of 1623423 is about 117.5286907454.

Adding to 1623423 its reverse (3243261), we get a palindrome (4866684).

The spelling of 1623423 in words is "one million, six hundred twenty-three thousand, four hundred twenty-three".