1123420144 has 120 divisors (see below), whose sum is σ = 2878843520. Its totient is φ = 414564480.

The previous prime is 1123420097. The next prime is 1123420153. The reversal of 1123420144 is 4410243211.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 255307 + ... + 259669.

Almost surely, 2^1123420144 is an apocalyptic number.

1123420144 is a gapful number since it is divisible by the number (14) 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 1123420144, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1439421760).

1123420144 is an abundant number, since it is smaller than the sum of its proper divisors (1755423376).

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

1123420144 is a wasteful number, since it uses less digits than its factorization.

1123420144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4419 (or 4402 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 22.

The square root of 1123420144 is about 33517.4602856481. The cubic root of 1123420144 is about 1039.5548341314.

Adding to 1123420144 its reverse (4410243211), we get a palindrome (5533663355).

The spelling of 1123420144 in words is "one billion, one hundred twenty-three million, four hundred twenty thousand, one hundred forty-four".