305399 has 4 divisors (see below), whose sum is σ = 315960. Its totient is φ = 294840.

The previous prime is 305377. The next prime is 305401. The reversal of 305399 is 993503.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 305399 - 2⁸ = 305143 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29), and also a Moran number because the ratio is a prime number: 10531 = 305399 / (3 + 0 + 5 + 3 + 9 + 9).

It is a Duffinian number.

It is a plaindrome in base 12.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (305329) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5237 + ... + 5294.

It is an arithmetic number, because the mean of its divisors is an integer number (78990).

2³⁰⁵³⁹⁹ is an apocalyptic number.

305399 is a deficient number, since it is larger than the sum of its proper divisors (10561).

305399 is a wasteful number, since it uses less digits than its factorization.

305399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10560.

The product of its (nonzero) digits is 3645, while the sum is 29.

The square root of 305399 is about 552.6291704208. The cubic root of 305399 is about 67.3424951317.

The spelling of 305399 in words is "three hundred five thousand, three hundred ninety-nine".