2261890 has 8 divisors (see below), whose sum is σ = 4071420. Its totient is φ = 904752.

The previous prime is 2261887. The next prime is 2261891. The reversal of 2261890 is 981622.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 2223081 + 38809 = 1491^2 + 197^2 .

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

It is a super-2 number, since 2×2261890² = 10232292744200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2261891) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 113085 + ... + 113104.

2^2261890 is an apocalyptic number.

2261890 is a deficient number, since it is larger than the sum of its proper divisors (1809530).

2261890 is a wasteful number, since it uses less digits than its factorization.

2261890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 226196.

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 2261890 is about 1503.9581111188. The cubic root of 2261890 is about 131.2674836875.

It can be divided in two parts, 226 and 1890, that added together give a square (2116 = 46²).

The spelling of 2261890 in words is "two million, two hundred sixty-one thousand, eight hundred ninety".