1305740 has 12 divisors (see below), whose sum is σ = 2742096. Its totient is φ = 522288.

The previous prime is 1305739. The next prime is 1305743. The reversal of 1305740 is 475031.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (20), and also a Moran number because the ratio is a prime number: 65287 = 1305740 / (1 + 3 + 0 + 5 + 7 + 4 + 0).

It is not an unprimeable number, because it can be changed into a prime (1305743) 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 3 ways as a sum of consecutive naturals, for example, 32624 + ... + 32663.

It is an arithmetic number, because the mean of its divisors is an integer number (228508).

2^1305740 is an apocalyptic number.

1305740 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1305740 is an abundant number, since it is smaller than the sum of its proper divisors (1436356).

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

1305740 is a wasteful number, since it uses less digits than its factorization.

1305740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65296 (or 65294 counting only the distinct ones).

The product of its (nonzero) digits is 420, while the sum is 20.

The square root of 1305740 is about 1142.6898091783. The cubic root of 1305740 is about 109.2996831138.

The spelling of 1305740 in words is "one million, three hundred five thousand, seven hundred forty".