1923609 has 4 divisors (see below), whose sum is σ = 2564816. Its totient is φ = 1282404.

The previous prime is 1923547. The next prime is 1923611. The reversal of 1923609 is 9063291.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 1923609 - 2⁸ = 1923353 is a prime.

It is a D-number.

It is a Duffinian number.

1923609 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1923659) 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, 320599 + ... + 320604.

It is an arithmetic number, because the mean of its divisors is an integer number (641204).

2^1923609 is an apocalyptic number.

It is an amenable number.

1923609 is a deficient number, since it is larger than the sum of its proper divisors (641207).

1923609 is an equidigital number, since it uses as much as digits as its factorization.

1923609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 641206.

The product of its (nonzero) digits is 2916, while the sum is 30.

The square root of 1923609 is about 1386.9423203580. The cubic root of 1923609 is about 124.3671265102.

The spelling of 1923609 in words is "one million, nine hundred twenty-three thousand, six hundred nine".