1240505505 has 12 divisors (see below), whose sum is σ = 2150209620. Its totient is φ = 661602912.

The previous prime is 1240505489. The next prime is 1240505507. The reversal of 1240505505 is 5055050421.

It can be written as a sum of positive squares in 2 ways, for example, as 627051681 + 613453824 = 25041^2 + 24768^2 .

It is not a de Polignac number, because 1240505505 - 2⁴ = 1240505489 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1240505507) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13783350 + ... + 13783439.

It is an arithmetic number, because the mean of its divisors is an integer number (179184135).

Almost surely, 2^1240505505 is an apocalyptic number.

1240505505 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1240505505 is a deficient number, since it is larger than the sum of its proper divisors (909704115).

1240505505 is a wasteful number, since it uses less digits than its factorization.

1240505505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27566800 (or 27566797 counting only the distinct ones).

The product of its (nonzero) digits is 5000, while the sum is 27.

The square root of 1240505505 is about 35220.8106806189. The cubic root of 1240505505 is about 1074.4830411446.

Adding to 1240505505 its reverse (5055050421), we get a palindrome (6295555926).

The spelling of 1240505505 in words is "one billion, two hundred forty million, five hundred five thousand, five hundred five".