2261340 has 72 divisors (see below), whose sum is σ = 7272720. Its totient is φ = 566784.

The previous prime is 2261309. The next prime is 2261353. The reversal of 2261340 is 431622.

It is a happy number.

It is a super-2 number, since 2×2261340² = 10227317191200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2691 + ... + 3429.

It is an arithmetic number, because the mean of its divisors is an integer number (101010).

2^2261340 is an apocalyptic number.

2261340 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 2261340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3636360).

2261340 is an abundant number, since it is smaller than the sum of its proper divisors (5011380).

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

2261340 is a wasteful number, since it uses less digits than its factorization.

2261340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 771 (or 766 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 2261340 is about 1503.7752491646. The cubic root of 2261340 is about 131.2568431806.

Adding to 2261340 its reverse (431622), we get a palindrome (2692962).

It can be divided in two parts, 2261 and 340, that added together give a square (2601 = 51²).

The spelling of 2261340 in words is "two million, two hundred sixty-one thousand, three hundred forty".