19881983940 has 96 divisors (see below), whose sum is σ = 68516394240. Its totient is φ = 4194878976.

The previous prime is 19881983897. The next prime is 19881983941. The reversal of 19881983940 is 4938918891.

It is a Harshad number since it is a multiple of its sum of digits (60).

It is not an unprimeable number, because it can be changed into a prime (19881983941) 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, 1815235 + ... + 1826154.

It is an arithmetic number, because the mean of its divisors is an integer number (713712440).

Almost surely, 2^19881983940 is an apocalyptic number.

19881983940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19881983940 is an abundant number, since it is smaller than the sum of its proper divisors (48634410300).

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

19881983940 is a wasteful number, since it uses less digits than its factorization.

19881983940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3641421 (or 3641419 counting only the distinct ones).

The product of its (nonzero) digits is 4478976, while the sum is 60.

The spelling of 19881983940 in words is "nineteen billion, eight hundred eighty-one million, nine hundred eighty-three thousand, nine hundred forty".