305057 has 4 divisors (see below), whose sum is σ = 308016. Its totient is φ = 302100.

The previous prime is 305047. The next prime is 305069. The reversal of 305057 is 750503.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 750503 = 13 ⋅57731.

It is a cyclic number.

It is not a de Polignac number, because 305057 - 2¹⁰ = 304033 is a prime.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 305057.

It is not an unprimeable number, because it can be changed into a prime (305017) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1319 + ... + 1532.

It is an arithmetic number, because the mean of its divisors is an integer number (77004).

2³⁰⁵⁰⁵⁷ is an apocalyptic number.

It is an amenable number.

305057 is a deficient number, since it is larger than the sum of its proper divisors (2959).

305057 is a wasteful number, since it uses less digits than its factorization.

305057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2958.

The product of its (nonzero) digits is 525, while the sum is 20.

The square root of 305057 is about 552.3196538238. The cubic root of 305057 is about 67.3173479900.

The spelling of 305057 in words is "three hundred five thousand, fifty-seven".