1123421200 has 240 divisors, whose sum is σ = 3258112896. Its totient is φ = 367206400.

The previous prime is 1123421179. The next prime is 1123421209. The reversal of 1123421200 is 21243211.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is not an unprimeable number, because it can be changed into a prime (1123421209) by changing a digit.

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 47 ways as a sum of consecutive naturals, for example, 1720074 + ... + 1720726.

Almost surely, 2^1123421200 is an apocalyptic number.

1123421200 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 1123421200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1629056448).

1123421200 is an abundant number, since it is smaller than the sum of its proper divisors (2134691696).

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

1123421200 is a wasteful number, since it uses less digits than its factorization.

1123421200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 722 (or 711 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 1123421200 is about 33517.4760386280. The cubic root of 1123421200 is about 1039.5551598539. Note that the first 3 decimals are identical.

Adding to 1123421200 its reverse (21243211), we get a palindrome (1144664411).

The spelling of 1123421200 in words is "one billion, one hundred twenty-three million, four hundred twenty-one thousand, two hundred".