2002645 has 8 divisors (see below), whose sum is σ = 2462040. Its totient is φ = 1562880.

The previous prime is 2002643. The next prime is 2002661. The reversal of 2002645 is 5462002.

2002645 = 443² + 444² + ... + 452².

It can be written as a sum of positive squares in 4 ways, for example, as 3249 + 1999396 = 57^2 + 1414^2 .

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

It is not a de Polignac number, because 2002645 - 2¹ = 2002643 is a prime.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2002643) 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 7 ways as a sum of consecutive naturals, for example, 4680 + ... + 5089.

It is an arithmetic number, because the mean of its divisors is an integer number (307755).

2^2002645 is an apocalyptic number.

It is an amenable number.

2002645 is a deficient number, since it is larger than the sum of its proper divisors (459395).

2002645 is an equidigital number, since it uses as much as digits as its factorization.

2002645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9815.

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

The square root of 2002645 is about 1415.1484021119. The cubic root of 2002645 is about 126.0476220425.

Adding to 2002645 its reverse (5462002), we get a palindrome (7464647).

The spelling of 2002645 in words is "two million, two thousand, six hundred forty-five".