1123403778 has 96 divisors (see below), whose sum is σ = 2843568000. Its totient is φ = 313901568.

The previous prime is 1123403777. The next prime is 1123403839. The reversal of 1123403778 is 8773043211.

It is not an unprimeable number, because it can be changed into a prime (1123403777) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2594250 + ... + 2594682.

It is an arithmetic number, because the mean of its divisors is an integer number (29620500).

Almost surely, 2^1123403778 is an apocalyptic number.

1123403778 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1123403778, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1421784000).

1123403778 is an abundant number, since it is smaller than the sum of its proper divisors (1720164222).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1123403778 is a wasteful number, since it uses less digits than its factorization.

1123403778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 856 (or 853 counting only the distinct ones).

The product of its (nonzero) digits is 28224, while the sum is 36.

The square root of 1123403778 is about 33517.2161433494. The cubic root of 1123403778 is about 1039.5497860239.

Adding to 1123403778 its reverse (8773043211), we get a palindrome (9896446989).

The spelling of 1123403778 in words is "one billion, one hundred twenty-three million, four hundred three thousand, seven hundred seventy-eight".