1123438440 has 32 divisors (see below), whose sum is σ = 3370315680. Its totient is φ = 299583552.

The previous prime is 1123438423. The next prime is 1123438447. The reversal of 1123438440 is 448343211.

1123438440 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×1123438440² = 2524227856939267200, which contains 22 as substring.

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

It is a junction number, because it is equal to n+sod(n) for n = 1123438398 and 1123438407.

It is not an unprimeable number, because it can be changed into a prime (1123438447) 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, 4680874 + ... + 4681113.

It is an arithmetic number, because the mean of its divisors is an integer number (105322365).

Almost surely, 2^1123438440 is an apocalyptic number.

1123438440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1123438440 is an abundant number, since it is smaller than the sum of its proper divisors (2246877240).

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

1123438440 is a wasteful number, since it uses less digits than its factorization.

1123438440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9362001 (or 9361997 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 30.

The square root of 1123438440 is about 33517.7332169107. The cubic root of 1123438440 is about 1039.5604774911.

The spelling of 1123438440 in words is "one billion, one hundred twenty-three million, four hundred thirty-eight thousand, four hundred forty".