305490905 has 4 divisors (see below), whose sum is σ = 366589092. Its totient is φ = 244392720.

The previous prime is 305490869. The next prime is 305490917. The reversal of 305490905 is 509094503.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 509094503 = 7247 ⋅70249.

It can be written as a sum of positive squares in 2 ways, for example, as 40094224 + 265396681 = 6332^2 + 16291^2 .

It is not a de Polignac number, because 305490905 - 2⁶ = 305490841 is a prime.

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

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30549086 + ... + 30549095.

It is an arithmetic number, because the mean of its divisors is an integer number (91647273).

Almost surely, 2^305490905 is an apocalyptic number.

It is an amenable number.

305490905 is a deficient number, since it is larger than the sum of its proper divisors (61098187).

305490905 is an equidigital number, since it uses as much as digits as its factorization.

305490905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61098186.

The product of its (nonzero) digits is 24300, while the sum is 35.

The square root of 305490905 is about 17478.2981150912. The cubic root of 305490905 is about 673.4924967386.

The spelling of 305490905 in words is "three hundred five million, four hundred ninety thousand, nine hundred five".