2305640 has 16 divisors (see below), whose sum is σ = 5187780. Its totient is φ = 922240.

The previous prime is 2305637. The next prime is 2305643. The reversal of 2305640 is 465032.

It is an interprime number because it is at equal distance from previous prime (2305637) and next prime (2305643).

It can be written as a sum of positive squares in 2 ways, for example, as 1943236 + 362404 = 1394^2 + 602^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is not an unprimeable number, because it can be changed into a prime (2305643) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28781 + ... + 28860.

2^2305640 is an apocalyptic number.

2305640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2305640 is an abundant number, since it is smaller than the sum of its proper divisors (2882140).

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

2305640 is a wasteful number, since it uses less digits than its factorization.

2305640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57652 (or 57648 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 20.

The square root of 2305640 is about 1518.4334032153. The cubic root of 2305640 is about 132.1084202587.

The spelling of 2305640 in words is "two million, three hundred five thousand, six hundred forty".