1005420305 has 4 divisors (see below), whose sum is σ = 1206504372. Its totient is φ = 804336240.

The previous prime is 1005420301. The next prime is 1005420323. The reversal of 1005420305 is 5030245001.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 202094656 + 803325649 = 14216^2 + 28343^2 .

It is not a de Polignac number, because 1005420305 - 2² = 1005420301 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1005420301) 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, 100542026 + ... + 100542035.

It is an arithmetic number, because the mean of its divisors is an integer number (301626093).

Almost surely, 2^1005420305 is an apocalyptic number.

It is an amenable number.

1005420305 is a deficient number, since it is larger than the sum of its proper divisors (201084067).

1005420305 is an equidigital number, since it uses as much as digits as its factorization.

1005420305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 201084066.

The product of its (nonzero) digits is 600, while the sum is 20.

The square root of 1005420305 is about 31708.3633289389. The cubic root of 1005420305 is about 1001.8035137162.

Adding to 1005420305 its reverse (5030245001), we get a palindrome (6035665306).

The spelling of 1005420305 in words is "one billion, five million, four hundred twenty thousand, three hundred five".