1123456440 has 32 divisors (see below), whose sum is σ = 3370369680. Its totient is φ = 299588352.

The previous prime is 1123456427. The next prime is 1123456471. The reversal of 1123456440 is 446543211.

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 = 1123456398 and 1123456407.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4680949 + ... + 4681188.

Almost surely, 2^1123456440 is an apocalyptic number.

1123456440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1123456440 is an abundant number, since it is smaller than the sum of its proper divisors (2246913240).

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

1123456440 is a wasteful number, since it uses less digits than its factorization.

1123456440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9362151 (or 9362147 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 30.

The square root of 1123456440 is about 33518.0017304135. The cubic root of 1123456440 is about 1039.5660294905.

Adding to 1123456440 its reverse (446543211), we get a palindrome (1569999651).

The spelling of 1123456440 in words is "one billion, one hundred twenty-three million, four hundred fifty-six thousand, four hundred forty".