2321905 has 4 divisors (see below), whose sum is σ = 2786292. Its totient is φ = 1857520.

The previous prime is 2321899. The next prime is 2321909. The reversal of 2321905 is 5091232.

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 703921 + 1617984 = 839^2 + 1272^2 .

It is not a de Polignac number, because 2321905 - 2⁹ = 2321393 is a prime.

It is a Duffinian number.

It is a zygodrome in base 3.

It is not an unprimeable number, because it can be changed into a prime (2321909) 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, 232186 + ... + 232195.

It is an arithmetic number, because the mean of its divisors is an integer number (696573).

2^2321905 is an apocalyptic number.

It is an amenable number.

2321905 is a deficient number, since it is larger than the sum of its proper divisors (464387).

2321905 is an equidigital number, since it uses as much as digits as its factorization.

2321905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 464386.

The product of its (nonzero) digits is 540, while the sum is 22.

The square root of 2321905 is about 1523.7798397406. The cubic root of 2321905 is about 132.4183429465.

The spelling of 2321905 in words is "two million, three hundred twenty-one thousand, nine hundred five".