305143730 has 16 divisors (see below), whose sum is σ = 562656024. Its totient is φ = 119080320.

The previous prime is 305143721. The next prime is 305143733. The reversal of 305143730 is 37341503.

It can be written as a sum of positive squares in 4 ways, for example, as 94342369 + 210801361 = 9713^2 + 14519^2 .

It is a super-2 number, since 2×305143730² = 186225391916625800, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 305143730.

It is not an unprimeable number, because it can be changed into a prime (305143733) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 371717 + ... + 372536.

Almost surely, 2^305143730 is an apocalyptic number.

305143730 is a deficient number, since it is larger than the sum of its proper divisors (257512294).

305143730 is a wasteful number, since it uses less digits than its factorization.

305143730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 744301.

The product of its (nonzero) digits is 3780, while the sum is 26.

The square root of 305143730 is about 17468.3636898251. The cubic root of 305143730 is about 673.2372699496.

The spelling of 305143730 in words is "three hundred five million, one hundred forty-three thousand, seven hundred thirty".