2106690 has 16 divisors (see below), whose sum is σ = 5056128. Its totient is φ = 561776.

The previous prime is 2106679. The next prime is 2106733. The reversal of 2106690 is 966012.

It is a super-4 number, since 4×2106690⁴ (a number of 26 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

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 self number, because there is not a number n which added to its sum of digits gives 2106690.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35082 + ... + 35141.

It is an arithmetic number, because the mean of its divisors is an integer number (316008).

2^2106690 is an apocalyptic number.

2106690 is an abundant number, since it is smaller than the sum of its proper divisors (2949438).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2106690 is a wasteful number, since it uses less digits than its factorization.

2106690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70233.

The product of its (nonzero) digits is 648, while the sum is 24.

The square root of 2106690 is about 1451.4441084658. Note that the first 3 decimals coincide. The cubic root of 2106690 is about 128.1937576617.

The spelling of 2106690 in words is "two million, one hundred six thousand, six hundred ninety".