1999960440 has 64 divisors (see below), whose sum is σ = 6047170560. Its totient is φ = 529119360.

The previous prime is 1999960439. The next prime is 1999960477. The reversal of 1999960440 is 440699991.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 50376 + ... + 80855.

It is an arithmetic number, because the mean of its divisors is an integer number (94487040).

Almost surely, 2^1999960440 is an apocalyptic number.

1999960440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1999960440 is an abundant number, since it is smaller than the sum of its proper divisors (4047210120).

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

1999960440 is a wasteful number, since it uses less digits than its factorization.

1999960440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131372 (or 131368 counting only the distinct ones).

The product of its (nonzero) digits is 629856, while the sum is 51.

The square root of 1999960440 is about 44720.9172535627. The cubic root of 1999960440 is about 1259.9127427606.

The spelling of 1999960440 in words is "one billion, nine hundred ninety-nine million, nine hundred sixty thousand, four hundred forty".