2103645 has 16 divisors (see below), whose sum is σ = 3424320. Its totient is φ = 1102464.

The previous prime is 2103617. The next prime is 2103653. The reversal of 2103645 is 5463012.

It is a happy number.

2103645 is nontrivially palindromic in base 9.

It is not a de Polignac number, because 2103645 - 2⁵ = 2103613 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 304 + ... + 2073.

It is an arithmetic number, because the mean of its divisors is an integer number (214020).

2^2103645 is an apocalyptic number.

It is an amenable number.

2103645 is a deficient number, since it is larger than the sum of its proper divisors (1320675).

2103645 is a wasteful number, since it uses less digits than its factorization.

2103645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2444.

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 2103645 is about 1450.3947738461. The cubic root of 2103645 is about 128.1319643250.

Adding to 2103645 its reverse (5463012), we get a palindrome (7566657).

The spelling of 2103645 in words is "two million, one hundred three thousand, six hundred forty-five".