1305440 has 48 divisors (see below), whose sum is σ = 3175200. Its totient is φ = 506880.

The previous prime is 1305431. The next prime is 1305449. The reversal of 1305440 is 445031.

It is an interprime number because it is at equal distance from previous prime (1305431) and next prime (1305449).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1305449) 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 7 ways as a sum of consecutive naturals, for example, 6461 + ... + 6659.

It is an arithmetic number, because the mean of its divisors is an integer number (66150).

2^1305440 is an apocalyptic number.

1305440 is a gapful number since it is divisible by the number (10) 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 1305440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1587600).

1305440 is an abundant number, since it is smaller than the sum of its proper divisors (1869760).

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

1305440 is a wasteful number, since it uses less digits than its factorization.

1305440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 255 (or 247 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 17.

The square root of 1305440 is about 1142.5585324175. The cubic root of 1305440 is about 109.2913117646.

The spelling of 1305440 in words is "one million, three hundred five thousand, four hundred forty".