305405073 has 28 divisors (see below), whose sum is σ = 463781760. Its totient is φ = 200988216.

The previous prime is 305405053. The next prime is 305405077. The reversal of 305405073 is 370504503.

It is a happy number.

305405073 is a `hidden beast` number, since 3 + 0 + 540 + 50 + 73 = 666.

It is not a de Polignac number, because 305405073 - 2⁵ = 305405041 is a prime.

It is a super-2 number, since 2×305405073² = 186544517228270658, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (305405077) 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 27 ways as a sum of consecutive naturals, for example, 54940 + ... + 60242.

Almost surely, 2^305405073 is an apocalyptic number.

It is an amenable number.

305405073 is a deficient number, since it is larger than the sum of its proper divisors (158376687).

305405073 is an frugal number, since it uses more digits than its factorization.

305405073 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5400 (or 5385 counting only the distinct ones).

The product of its (nonzero) digits is 6300, while the sum is 27.

The square root of 305405073 is about 17475.8425547955. The cubic root of 305405073 is about 673.4294150758.

Adding to 305405073 its reverse (370504503), we get a palindrome (675909576).

The spelling of 305405073 in words is "three hundred five million, four hundred five thousand, seventy-three".