1123456787 has 16 divisors (see below), whose sum is σ = 1155749760. Its totient is φ = 1091750400.

The previous prime is 1123456769. The next prime is 1123456793. The reversal of 1123456787 is 7876543211.

It is a cyclic number.

It is not a de Polignac number, because 1123456787 - 2¹⁰ = 1123455763 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1123456727) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2156087 + ... + 2156607.

It is an arithmetic number, because the mean of its divisors is an integer number (72234360).

Almost surely, 2^1123456787 is an apocalyptic number.

1123456787 is a deficient number, since it is larger than the sum of its proper divisors (32292973).

1123456787 is a wasteful number, since it uses less digits than its factorization.

1123456787 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 974.

The product of its digits is 282240, while the sum is 44.

The square root of 1123456787 is about 33518.0069067360. The cubic root of 1123456787 is about 1039.5661365202.

Adding to 1123456787 its reverse (7876543211), we get a palindrome (8999999998).

The spelling of 1123456787 in words is "one billion, one hundred twenty-three million, four hundred fifty-six thousand, seven hundred eighty-seven".