2102645 has 16 divisors (see below), whose sum is σ = 2766960. Its totient is φ = 1526784.

The previous prime is 2102629. The next prime is 2102647. The reversal of 2102645 is 5462012.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 69169 + 2033476 = 263^2 + 1426^2 .

It is a cyclic number.

It is not a de Polignac number, because 2102645 - 2⁴ = 2102629 is a prime.

It is a super-2 number, since 2×2102645² = 8842231992050, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2102647) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2039 + ... + 2891.

It is an arithmetic number, because the mean of its divisors is an integer number (172935).

2^2102645 is an apocalyptic number.

It is an amenable number.

2102645 is a deficient number, since it is larger than the sum of its proper divisors (664315).

2102645 is a wasteful number, since it uses less digits than its factorization.

2102645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 904.

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 2102645 is about 1450.0499991380. The cubic root of 2102645 is about 128.1116579405. Note that the first 3 decimals are identical.

Adding to 2102645 its reverse (5462012), we get a palindrome (7564657).

The spelling of 2102645 in words is "two million, one hundred two thousand, six hundred forty-five".