2321665 has 8 divisors (see below), whose sum is σ = 2838888. Its totient is φ = 1822080.

The previous prime is 2321647. The next prime is 2321677. The reversal of 2321665 is 5661232.

It can be written as a sum of positive squares in 4 ways, for example, as 80656 + 2241009 = 284^2 + 1497^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2321665 - 2⁹ = 2321153 is a prime.

It is a d-powerful number, because it can be written as 2¹⁷ + 3 + 2²¹ + 1 + 6⁶ + 6⁶ + 5³ .

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4116 + ... + 4645.

It is an arithmetic number, because the mean of its divisors is an integer number (354861).

2^2321665 is an apocalyptic number.

It is an amenable number.

2321665 is a deficient number, since it is larger than the sum of its proper divisors (517223).

2321665 is an equidigital number, since it uses as much as digits as its factorization.

2321665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8819.

The product of its digits is 2160, while the sum is 25.

The square root of 2321665 is about 1523.7010861714. The cubic root of 2321665 is about 132.4137803858.

Adding to 2321665 its reverse (5661232), we get a palindrome (7982897).

The spelling of 2321665 in words is "two million, three hundred twenty-one thousand, six hundred sixty-five".