4645 has 4 divisors (see below), whose sum is σ = 5580. Its totient is φ = 3712.

The previous prime is 4643. The next prime is 4649. The reversal of 4645 is 5464.

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 676 + 3969 = 26^2 + 63^2 .

It is a cyclic number.

It is not a de Polignac number, because 4645 - 2¹ = 4643 is a prime.

4645 is a lucky number.

It is a plaindrome in base 14, base 15 and base 16.

It is a nialpdrome in base 9.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 460 + ... + 469.

It is an arithmetic number, because the mean of its divisors is an integer number (1395).

2⁴⁶⁴⁵ is an apocalyptic number.

It is an amenable number.

4645 is a deficient number, since it is larger than the sum of its proper divisors (935).

4645 is an equidigital number, since it uses as much as digits as its factorization.

4645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 934.

The product of its digits is 480, while the sum is 19.

The square root of 4645 is about 68.1542368456. The cubic root of 4645 is about 16.6850907368.

Adding to 4645 its sum of digits (19), we get a palindrome (4664).

It can be divided in two parts, 46 and 45, that added together give a triangular number (91 = T₁₃).

The spelling of 4645 in words is "four thousand, six hundred forty-five".