2104645 has 4 divisors (see below), whose sum is σ = 2525580. Its totient is φ = 1683712.

The previous prime is 2104643. The next prime is 2104657. The reversal of 2104645 is 5464012.

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 544644 + 1560001 = 738^2 + 1249^2 .

It is a cyclic number.

It is not a de Polignac number, because 2104645 - 2¹ = 2104643 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2104643) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 210460 + ... + 210469.

It is an arithmetic number, because the mean of its divisors is an integer number (631395).

2^2104645 is an apocalyptic number.

It is an amenable number.

2104645 is a deficient number, since it is larger than the sum of its proper divisors (420935).

2104645 is an equidigital number, since it uses as much as digits as its factorization.

2104645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 420934.

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 2104645 is about 1450.7394666169. The cubic root of 2104645 is about 128.1522642752.

Adding to 2104645 its reverse (5464012), we get a palindrome (7568657).

The spelling of 2104645 in words is "two million, one hundred four thousand, six hundred forty-five".