305304381 has 6 divisors (see below), whose sum is σ = 440995230. Its totient is φ = 203536248.

The previous prime is 305304371. The next prime is 305304457. The reversal of 305304381 is 183403503.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 233631225 + 71673156 = 15285^2 + 8466^2 .

It is not a de Polignac number, because 305304381 - 2⁷ = 305304253 is a prime.

It is a super-2 number, since 2×305304381² = 186421530115586322, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (305304301) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 16961346 + ... + 16961363.

It is an arithmetic number, because the mean of its divisors is an integer number (73499205).

Almost surely, 2^305304381 is an apocalyptic number.

It is an amenable number.

305304381 is a deficient number, since it is larger than the sum of its proper divisors (135690849).

305304381 is a wasteful number, since it uses less digits than its factorization.

305304381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33922715 (or 33922712 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

The square root of 305304381 is about 17472.9614261578. The cubic root of 305304381 is about 673.3553970866.

Adding to 305304381 its reverse (183403503), we get a palindrome (488707884).

The spelling of 305304381 in words is "three hundred five million, three hundred four thousand, three hundred eighty-one".