1040323440 has 160 divisors (see below), whose sum is σ = 3495401280. Its totient is φ = 255949824.

The previous prime is 1040323393. The next prime is 1040323447. The reversal of 1040323440 is 443230401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1040323447) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 526294 + ... + 528266.

It is an arithmetic number, because the mean of its divisors is an integer number (21846258).

Almost surely, 2^1040323440 is an apocalyptic number.

1040323440 is a gapful number since it is divisible by the number (10) 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 1040323440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1747700640).

1040323440 is an abundant number, since it is smaller than the sum of its proper divisors (2455077840).

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

1040323440 is a wasteful number, since it uses less digits than its factorization.

1040323440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2028 (or 1996 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 21.

The square root of 1040323440 is about 32254.0453276794. The cubic root of 1040323440 is about 1013.2644237921.

Adding to 1040323440 its reverse (443230401), we get a palindrome (1483553841).

The spelling of 1040323440 in words is "one billion, forty million, three hundred twenty-three thousand, four hundred forty".