2261840 has 60 divisors (see below), whose sum is σ = 6127956. Its totient is φ = 774144.

The previous prime is 2261839. The next prime is 2261851. The reversal of 2261840 is 481622.

It can be written as a sum of positive squares in 2 ways, for example, as 1731856 + 529984 = 1316^2 + 728^2 .

It is a congruent number.

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, 3632 + ... + 4208.

2^2261840 is an apocalyptic number.

2261840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2261840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3063978).

2261840 is an abundant number, since it is smaller than the sum of its proper divisors (3866116).

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

2261840 is a wasteful number, since it uses less digits than its factorization.

2261840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 604 (or 591 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 23.

The square root of 2261840 is about 1503.9414882235. The cubic root of 2261840 is about 131.2665164400.

The spelling of 2261840 in words is "two million, two hundred sixty-one thousand, eight hundred forty".