1305403040 has 24 divisors (see below), whose sum is σ = 3084015060. Its totient is φ = 522161152.

The previous prime is 1305403039. The next prime is 1305403063. The reversal of 1305403040 is 403045031.

It can be written as a sum of positive squares in 2 ways, for example, as 1197990544 + 107412496 = 34612^2 + 10364^2 .

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4079225 + ... + 4079544.

Almost surely, 2^1305403040 is an apocalyptic number.

1305403040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1305403040 is an abundant number, since it is smaller than the sum of its proper divisors (1778612020).

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

1305403040 is an equidigital number, since it uses as much as digits as its factorization.

1305403040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8158784 (or 8158776 counting only the distinct ones).

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

The square root of 1305403040 is about 36130.3617474279. The cubic root of 1305403040 is about 1092.9028032567.

Adding to 1305403040 its reverse (403045031), we get a palindrome (1708448071).

The spelling of 1305403040 in words is "one billion, three hundred five million, four hundred three thousand, forty".