19440509900 has 54 divisors (see below), whose sum is σ = 49073413788. Its totient is φ = 6665316000.

The previous prime is 19440509849. The next prime is 19440509911. The reversal of 19440509900 is 990504491.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 1978826 + ... + 1988625.

It is an arithmetic number, because the mean of its divisors is an integer number (908766922).

Almost surely, 2^19440509900 is an apocalyptic number.

19440509900 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19440509900 is an abundant number, since it is smaller than the sum of its proper divisors (29632903888).

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

19440509900 is a wasteful number, since it uses less digits than its factorization.

19440509900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3967479 (or 3967465 counting only the distinct ones).

The product of its (nonzero) digits is 58320, while the sum is 41.

The spelling of 19440509900 in words is "nineteen billion, four hundred forty million, five hundred nine thousand, nine hundred".