2009890 has 8 divisors (see below), whose sum is σ = 3617820. Its totient is φ = 803952.

The previous prime is 2009881. The next prime is 2009897. The reversal of 2009890 is 989002.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1962801 + 47089 = 1401^2 + 217^2 .

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

It is not an unprimeable number, because it can be changed into a prime (2009897) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 100485 + ... + 100504.

2^2009890 is an apocalyptic number.

2009890 is a deficient number, since it is larger than the sum of its proper divisors (1607930).

2009890 is a wasteful number, since it uses less digits than its factorization.

2009890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 200996.

The product of its (nonzero) digits is 1296, while the sum is 28.

The square root of 2009890 is about 1417.7058933361. The cubic root of 2009890 is about 126.1994405923.

The spelling of 2009890 in words is "two million, nine thousand, eight hundred ninety".