1040340440 has 32 divisors (see below), whose sum is σ = 2463966000. Its totient is φ = 394233984.

The previous prime is 1040340419. The next prime is 1040340443. The reversal of 1040340440 is 440430401.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1040340443) 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, 683675 + ... + 685194.

Almost surely, 2^1040340440 is an apocalyptic number.

1040340440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1040340440 is an abundant number, since it is smaller than the sum of its proper divisors (1423625560).

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

1040340440 is a wasteful number, since it uses less digits than its factorization.

1040340440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1368899 (or 1368895 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 20.

The square root of 1040340440 is about 32254.3088594377. The cubic root of 1040340440 is about 1013.2699430375.

Adding to 1040340440 its reverse (440430401), we get a palindrome (1480770841).

The spelling of 1040340440 in words is "one billion, forty million, three hundred forty thousand, four hundred forty".