2291890 has 8 divisors (see below), whose sum is σ = 4125420. Its totient is φ = 916752.

The previous prime is 2291867. The next prime is 2291893. The reversal of 2291890 is 981922.

2291890 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 1852321 + 439569 = 1361^2 + 663^2 .

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 (2291893) 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, 114585 + ... + 114604.

2^2291890 is an apocalyptic number.

2291890 is a deficient number, since it is larger than the sum of its proper divisors (1833530).

2291890 is a wasteful number, since it uses less digits than its factorization.

2291890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 229196.

The product of its (nonzero) digits is 2592, while the sum is 31.

The square root of 2291890 is about 1513.8989398239. The cubic root of 2291890 is about 131.8452809202.

The spelling of 2291890 in words is "two million, two hundred ninety-one thousand, eight hundred ninety".