1123420172 has 48 divisors (see below), whose sum is σ = 2324669760. Its totient is φ = 465024000.

The previous prime is 1123420153. The next prime is 1123420187. The reversal of 1123420172 is 2710243211.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 111104 + ... + 120792.

It is an arithmetic number, because the mean of its divisors is an integer number (48430620).

Almost surely, 2^1123420172 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1123420172, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1162334880).

1123420172 is an abundant number, since it is smaller than the sum of its proper divisors (1201249588).

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

1123420172 is a wasteful number, since it uses less digits than its factorization.

1123420172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9842 (or 9840 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 23.

The square root of 1123420172 is about 33517.4607033409. The cubic root of 1123420172 is about 1039.5548427680.

Adding to 1123420172 its reverse (2710243211), we get a palindrome (3833663383).

The spelling of 1123420172 in words is "one billion, one hundred twenty-three million, four hundred twenty thousand, one hundred seventy-two".