1125811830 has 96 divisors (see below), whose sum is σ = 3198498912. Its totient is φ = 251919360.

The previous prime is 1125811829. The next prime is 1125811837. The reversal of 1125811830 is 381185211.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1125811837) 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, 35262 + ... + 59118.

It is an arithmetic number, because the mean of its divisors is an integer number (33317697).

Almost surely, 2^1125811830 is an apocalyptic number.

1125811830 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1125811830, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1599249456).

1125811830 is an abundant number, since it is smaller than the sum of its proper divisors (2072687082).

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

1125811830 is a wasteful number, since it uses less digits than its factorization.

1125811830 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23902 (or 23891 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 30.

The square root of 1125811830 is about 33553.1195271021. The cubic root of 1125811830 is about 1040.2920253653.

It can be divided in two parts, 112581 and 1830, that added together give a palindrome (114411).

The spelling of 1125811830 in words is "one billion, one hundred twenty-five million, eight hundred eleven thousand, eight hundred thirty".