1040123440 has 20 divisors (see below), whose sum is σ = 2418287184. Its totient is φ = 416049344.

The previous prime is 1040123429. The next prime is 1040123443. The reversal of 1040123440 is 443210401.

It is a tau number, because it is divible by the number of its divisors (20).

It is not an unprimeable number, because it can be changed into a prime (1040123443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6500692 + ... + 6500851.

Almost surely, 2^1040123440 is an apocalyptic number.

1040123440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1040123440 is an abundant number, since it is smaller than the sum of its proper divisors (1378163744).

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

1040123440 is a wasteful number, since it uses less digits than its factorization.

1040123440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13001556 (or 13001550 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 1040123440 is about 32250.9447923623. The cubic root of 1040123440 is about 1013.1994869769.

Adding to 1040123440 its reverse (443210401), we get a palindrome (1483333841).

The spelling of 1040123440 in words is "one billion, forty million, one hundred twenty-three thousand, four hundred forty".