2102945 has 8 divisors (see below), whose sum is σ = 2717736. Its totient is φ = 1552896.

The previous prime is 2102941. The next prime is 2102999. The reversal of 2102945 is 5492012.

It can be written as a sum of positive squares in 4 ways, for example, as 234256 + 1868689 = 484^2 + 1367^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 2102945 - 2² = 2102941 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 2102945.

It is not an unprimeable number, because it can be changed into a prime (2102941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16112 + ... + 16241.

It is an arithmetic number, because the mean of its divisors is an integer number (339717).

2^2102945 is an apocalyptic number.

It is an amenable number.

2102945 is a deficient number, since it is larger than the sum of its proper divisors (614791).

2102945 is a wasteful number, since it uses less digits than its factorization.

2102945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32371.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 2102945 is about 1450.1534401573. The cubic root of 2102945 is about 128.1177505317.

Adding to 2102945 its reverse (5492012), we get a palindrome (7594957).

The spelling of 2102945 in words is "two million, one hundred two thousand, nine hundred forty-five".