305869 has 4 divisors (see below), whose sum is σ = 307296. Its totient is φ = 304444.

The previous prime is 305867. The next prime is 305873. The reversal of 305869 is 968503.

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.

It is a cyclic number.

It is not a de Polignac number, because 305869 - 2¹ = 305867 is a prime.

It is a super-2 number, since 2×305869² = 187111690322, which contains 22 as substring.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a self number, because there is not a number n which added to its sum of digits gives 305869.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (305861) 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, 319 + ... + 844.

It is an arithmetic number, because the mean of its divisors is an integer number (76824).

2³⁰⁵⁸⁶⁹ is an apocalyptic number.

It is an amenable number.

305869 is a deficient number, since it is larger than the sum of its proper divisors (1427).

305869 is a wasteful number, since it uses less digits than its factorization.

305869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1426.

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 305869 is about 553.0542468872. The cubic root of 305869 is about 67.3770234590.

The spelling of 305869 in words is "three hundred five thousand, eight hundred sixty-nine".