1123109780 has 72 divisors (see below), whose sum is σ = 2665135872. Its totient is φ = 396629376.

The previous prime is 1123109759. The next prime is 1123109783. The reversal of 1123109780 is 879013211.

It is a super-2 number, since 2×1123109780² = 2522751155863296800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1123109783) 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, 70517 + ... + 84963.

It is an arithmetic number, because the mean of its divisors is an integer number (37015776).

Almost surely, 2^1123109780 is an apocalyptic number.

1123109780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1123109780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1332567936).

1123109780 is an abundant number, since it is smaller than the sum of its proper divisors (1542026092).

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

1123109780 is a wasteful number, since it uses less digits than its factorization.

1123109780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14505 (or 14490 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 32.

The square root of 1123109780 is about 33512.8300804334. The cubic root of 1123109780 is about 1039.4590937222.

The spelling of 1123109780 in words is "one billion, one hundred twenty-three million, one hundred nine thousand, seven hundred eighty".