2102605 has 4 divisors (see below), whose sum is σ = 2523132. Its totient is φ = 1682080.

The previous prime is 2102593. The next prime is 2102623. The reversal of 2102605 is 5062012.

It is a happy number.

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 499849 + 1602756 = 707^2 + 1266^2 .

It is not a de Polignac number, because 2102605 - 2¹³ = 2094413 is a prime.

It is a Duffinian number.

2102605 is a lucky number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 210256 + ... + 210265.

It is an arithmetic number, because the mean of its divisors is an integer number (630783).

2^2102605 is an apocalyptic number.

It is an amenable number.

2102605 is a deficient number, since it is larger than the sum of its proper divisors (420527).

2102605 is an equidigital number, since it uses as much as digits as its factorization.

2102605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 420526.

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 2102605 is about 1450.0362064445. The cubic root of 2102605 is about 128.1108455512.

Adding to 2102605 its reverse (5062012), we get a palindrome (7164617).

The spelling of 2102605 in words is "two million, one hundred two thousand, six hundred five".