427909505 has 4 divisors (see below), whose sum is σ = 513491412. Its totient is φ = 342327600.

The previous prime is 427909463. The next prime is 427909511. The reversal of 427909505 is 505909724.

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 341214784 + 86694721 = 18472^2 + 9311^2 .

It is not a de Polignac number, because 427909505 - 2¹⁸ = 427647361 is a prime.

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, 42790946 + ... + 42790955.

It is an arithmetic number, because the mean of its divisors is an integer number (128372853).

Almost surely, 2^427909505 is an apocalyptic number.

It is an amenable number.

427909505 is a deficient number, since it is larger than the sum of its proper divisors (85581907).

427909505 is an equidigital number, since it uses as much as digits as its factorization.

427909505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85581906.

The product of its (nonzero) digits is 113400, while the sum is 41.

The square root of 427909505 is about 20685.9736294911. The cubic root of 427909505 is about 753.5590867820.

The spelling of 427909505 in words is "four hundred twenty-seven million, nine hundred nine thousand, five hundred five".