1123403240 has 32 divisors (see below), whose sum is σ = 2530586880. Its totient is φ = 448840512.

The previous prime is 1123403227. The next prime is 1123403243. The reversal of 1123403240 is 423043211.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is not an unprimeable number, because it can be changed into a prime (1123403243) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19649 + ... + 51311.

It is an arithmetic number, because the mean of its divisors is an integer number (79080840).

Almost surely, 2^1123403240 is an apocalyptic number.

1123403240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1123403240 is an abundant number, since it is smaller than the sum of its proper divisors (1407183640).

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

1123403240 is a wasteful number, since it uses less digits than its factorization.

1123403240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32561 (or 32557 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 1123403240 is about 33517.2081176222. The cubic root of 1123403240 is about 1039.5496200765.

Adding to 1123403240 its reverse (423043211), we get a palindrome (1546446451).

The spelling of 1123403240 in words is "one billion, one hundred twenty-three million, four hundred three thousand, two hundred forty".