1240123563 has 24 divisors (see below), whose sum is σ = 2068303328. Its totient is φ = 701332992.

The previous prime is 1240123553. The next prime is 1240123567. The reversal of 1240123563 is 3653210421.

It is not a de Polignac number, because 1240123563 - 2⁸ = 1240123307 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1240123567) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 95356 + ... + 107577.

Almost surely, 2^1240123563 is an apocalyptic number.

1240123563 is a deficient number, since it is larger than the sum of its proper divisors (828179765).

1240123563 is a wasteful number, since it uses less digits than its factorization.

1240123563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 203043 (or 203040 counting only the distinct ones).

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

The square root of 1240123563 is about 35215.3881563160. The cubic root of 1240123563 is about 1074.3727548337.

Adding to 1240123563 its reverse (3653210421), we get a palindrome (4893333984).

The spelling of 1240123563 in words is "one billion, two hundred forty million, one hundred twenty-three thousand, five hundred sixty-three".