19890281984 has 20 divisors (see below), whose sum is σ = 39741716784. Its totient is φ = 9945140736.

The previous prime is 19890281977. The next prime is 19890282023. The reversal of 19890281984 is 48918209891.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19423592 + ... + 19424615.

Almost surely, 2^19890281984 is an apocalyptic number.

It is an amenable number.

19890281984 is a deficient number, since it is larger than the sum of its proper divisors (19851434800).

19890281984 is an frugal number, since it uses more digits than its factorization.

19890281984 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38848225 (or 38848209 counting only the distinct ones).

The product of its (nonzero) digits is 2985984, while the sum is 59.

The spelling of 19890281984 in words is "nineteen billion, eight hundred ninety million, two hundred eighty-one thousand, nine hundred eighty-four".