1240312563 has 24 divisors (see below), whose sum is σ = 2091068928. Its totient is φ = 693668592.

The previous prime is 1240312543. The next prime is 1240312603. The reversal of 1240312563 is 3652130421.

1240312563 is a `hidden beast` number, since 1 + 2 + 403 + 1 + 256 + 3 = 666.

It is not a de Polignac number, because 1240312563 - 2⁵ = 1240312531 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1240312543) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 206481 + ... + 212402.

It is an arithmetic number, because the mean of its divisors is an integer number (87127872).

Almost surely, 2^1240312563 is an apocalyptic number.

1240312563 is a deficient number, since it is larger than the sum of its proper divisors (850756365).

1240312563 is a wasteful number, since it uses less digits than its factorization.

1240312563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 418943 (or 418940 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

The square root of 1240312563 is about 35218.0715400489. The cubic root of 1240312563 is about 1074.4273316899.

Adding to 1240312563 its reverse (3652130421), we get a palindrome (4892442984).

The spelling of 1240312563 in words is "one billion, two hundred forty million, three hundred twelve thousand, five hundred sixty-three".