1123208779 has 16 divisors (see below), whose sum is σ = 1414238976. Its totient is φ = 866556000.

The previous prime is 1123208777. The next prime is 1123208789. The reversal of 1123208779 is 9778023211.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1123208779 - 2¹ = 1123208777 is a prime.

It is a super-2 number, since 2×1123208779² = 2523195922445341682, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1123208777) 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, 64437 + ... + 79990.

It is an arithmetic number, because the mean of its divisors is an integer number (88389936).

Almost surely, 2^1123208779 is an apocalyptic number.

1123208779 is a deficient number, since it is larger than the sum of its proper divisors (291030197).

1123208779 is a wasteful number, since it uses less digits than its factorization.

1123208779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144546.

The product of its (nonzero) digits is 42336, while the sum is 40.

The square root of 1123208779 is about 33514.3070792162. The cubic root of 1123208779 is about 1039.4896346332.

It can be divided in two parts, 1123 and 208779, that added together give a palindrome (209902).

The spelling of 1123208779 in words is "one billion, one hundred twenty-three million, two hundred eight thousand, seven hundred seventy-nine".