2166290 has 24 divisors (see below), whose sum is σ = 4536972. Its totient is φ = 742560.

The previous prime is 2166289. The next prime is 2166319. The reversal of 2166290 is 926612.

It can be written as a sum of positive squares in 2 ways, for example, as 2140369 + 25921 = 1463^2 + 161^2 .

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 11 ways as a sum of consecutive naturals, for example, 1721 + ... + 2700.

2^2166290 is an apocalyptic number.

2166290 is an abundant number, since it is smaller than the sum of its proper divisors (2370682).

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

2166290 is a wasteful number, since it uses less digits than its factorization.

2166290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4442 (or 4435 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 26.

The square root of 2166290 is about 1471.8321915218. The cubic root of 2166290 is about 129.3914356740.

The spelling of 2166290 in words is "two million, one hundred sixty-six thousand, two hundred ninety".