1040020440 has 64 divisors (see below), whose sum is σ = 3255724800. Its totient is φ = 265279872.

The previous prime is 1040020439. The next prime is 1040020453. The reversal of 1040020440 is 440200401.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 185650 + ... + 191169.

It is an arithmetic number, because the mean of its divisors is an integer number (50870700).

Almost surely, 2^1040020440 is an apocalyptic number.

1040020440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1040020440 is an abundant number, since it is smaller than the sum of its proper divisors (2215704360).

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

1040020440 is a wasteful number, since it uses less digits than its factorization.

1040020440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 376856 (or 376852 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 15.

The square root of 1040020440 is about 32249.3479003840. The cubic root of 1040020440 is about 1013.1660412697.

Adding to 1040020440 its reverse (440200401), we get a palindrome (1480220841).

The spelling of 1040020440 in words is "one billion, forty million, twenty thousand, four hundred forty".