305090 has 8 divisors (see below), whose sum is σ = 549180. Its totient is φ = 122032.

The previous prime is 305069. The next prime is 305093. The reversal of 305090 is 90503.

It can be written as a sum of positive squares in 2 ways, for example, as 247009 + 58081 = 497^2 + 241^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an alternating number because its digits alternate between odd and even.

It is not an unprimeable number, because it can be changed into a prime (305093) 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, 15245 + ... + 15264.

2³⁰⁵⁰⁹⁰ is an apocalyptic number.

305090 is a deficient number, since it is larger than the sum of its proper divisors (244090).

305090 is a wasteful number, since it uses less digits than its factorization.

305090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30516.

The product of its (nonzero) digits is 135, while the sum is 17.

The square root of 305090 is about 552.3495270207. The cubic root of 305090 is about 67.3197752876.

Adding to 305090 its reverse (90503), we get a palindrome (395593).

The spelling of 305090 in words is "three hundred five thousand, ninety".