12730305 has 32 divisors (see below), whose sum is σ = 24035328. Its totient is φ = 5630400.

The previous prime is 12730303. The next prime is 12730307. The reversal of 12730305 is 50303721.

It is a happy number.

12730305 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (12730303) and next prime (12730307).

It is not a de Polignac number, because 12730305 - 2¹ = 12730303 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (12730303) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1300 + ... + 5210.

It is an arithmetic number, because the mean of its divisors is an integer number (751104).

Almost surely, 2^12730305 is an apocalyptic number.

12730305 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12730305 is a deficient number, since it is larger than the sum of its proper divisors (11305023).

12730305 is a wasteful number, since it uses less digits than its factorization.

12730305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3957.

The product of its (nonzero) digits is 630, while the sum is 21.

The square root of 12730305 is about 3567.9552968052. The cubic root of 12730305 is about 233.4960848660.

The spelling of 12730305 in words is "twelve million, seven hundred thirty thousand, three hundred five".