2106645 has 8 divisors (see below), whose sum is σ = 3370656. Its totient is φ = 1123536.

The previous prime is 2106631. The next prime is 2106653. The reversal of 2106645 is 5466012.

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

It is not a de Polignac number, because 2106645 - 2⁸ = 2106389 is a prime.

It is a Smith number, since the sum of its digits (24) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

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, 70207 + ... + 70236.

It is an arithmetic number, because the mean of its divisors is an integer number (421332).

2^2106645 is an apocalyptic number.

It is an amenable number.

2106645 is a deficient number, since it is larger than the sum of its proper divisors (1264011).

2106645 is a wasteful number, since it uses less digits than its factorization.

2106645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140451.

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 2106645 is about 1451.4286065804. The cubic root of 2106645 is about 128.1928448933.

The spelling of 2106645 in words is "two million, one hundred six thousand, six hundred forty-five".