19408729908 has 12 divisors (see below), whose sum is σ = 45287036480. Its totient is φ = 6469576632.

The previous prime is 19408729861. The next prime is 19408729927. The reversal of 19408729908 is 80992780491.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 808697068 + ... + 808697091.

Almost surely, 2^19408729908 is an apocalyptic number.

It is an amenable number.

19408729908 is an abundant number, since it is smaller than the sum of its proper divisors (25878306572).

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

19408729908 is a wasteful number, since it uses less digits than its factorization.

19408729908 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1617394166 (or 1617394164 counting only the distinct ones).

The product of its (nonzero) digits is 2612736, while the sum is 57.

The spelling of 19408729908 in words is "nineteen billion, four hundred eight million, seven hundred twenty-nine thousand, nine hundred eight".