2991890 has 32 divisors (see below), whose sum is σ = 5987520. Its totient is φ = 1067200.

The previous prime is 2991889. The next prime is 2991899. The reversal of 2991890 is 981992.

2991890 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an Ulam number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2991899) 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 15 ways as a sum of consecutive naturals, for example, 6260 + ... + 6720.

It is an arithmetic number, because the mean of its divisors is an integer number (187110).

2^2991890 is an apocalyptic number.

2991890 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

2991890 is a wasteful number, since it uses less digits than its factorization.

2991890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 538.

The product of its (nonzero) digits is 11664, while the sum is 38.

The square root of 2991890 is about 1729.7080678542. The cubic root of 2991890 is about 144.0948770324.

It can be divided in two parts, 29 and 91890, that added together give a palindrome (91919).

The spelling of 2991890 in words is "two million, nine hundred ninety-one thousand, eight hundred ninety".