4321665 has 24 divisors (see below), whose sum is σ = 7556328. Its totient is φ = 2284800.

The previous prime is 4321663. The next prime is 4321703. The reversal of 4321665 is 5661234.

It can be written as a sum of positive squares in 4 ways, for example, as 1252161 + 3069504 = 1119^2 + 1752^2 .

It is not a de Polignac number, because 4321665 - 2¹ = 4321663 is a prime.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (4321663) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5815 + ... + 6515.

It is an arithmetic number, because the mean of its divisors is an integer number (314847).

Almost surely, 2^4321665 is an apocalyptic number.

4321665 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

It is an amenable number.

4321665 is a deficient number, since it is larger than the sum of its proper divisors (3234663).

4321665 is a wasteful number, since it uses less digits than its factorization.

4321665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 849 (or 846 counting only the distinct ones).

The product of its digits is 4320, while the sum is 27.

The square root of 4321665 is about 2078.8614672460. The cubic root of 4321665 is about 162.8859779440.

Adding to 4321665 its reverse (5661234), we get a palindrome (9982899).

The spelling of 4321665 in words is "four million, three hundred twenty-one thousand, six hundred sixty-five".