305124140 has 12 divisors (see below), whose sum is σ = 640760736. Its totient is φ = 122049648.

The previous prime is 305124139. The next prime is 305124151. The reversal of 305124140 is 41421503.

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: 15256207 = 305124140 / (3 + 0 + 5 + 1 + 2 + 4 + 1 + 4 + 0).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7628084 + ... + 7628123.

It is an arithmetic number, because the mean of its divisors is an integer number (53396728).

Almost surely, 2^305124140 is an apocalyptic number.

It is an amenable number.

305124140 is an abundant number, since it is smaller than the sum of its proper divisors (335636596).

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

305124140 is a wasteful number, since it uses less digits than its factorization.

305124140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15256216 (or 15256214 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 305124140 is about 17467.8029528616. The cubic root of 305124140 is about 673.2228625309. Note that the first 3 decimals are identical.

Adding to 305124140 its reverse (41421503), we get a palindrome (346545643).

The spelling of 305124140 in words is "three hundred five million, one hundred twenty-four thousand, one hundred forty".