19397994008 has 8 divisors (see below), whose sum is σ = 36371238780. Its totient is φ = 9698997000.

The previous prime is 19397993983. The next prime is 19397994023. The reversal of 19397994008 is 80049979391.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1212374618 + ... + 1212374633.

Almost surely, 2^19397994008 is an apocalyptic number.

It is an amenable number.

19397994008 is a deficient number, since it is larger than the sum of its proper divisors (16973244772).

19397994008 is a wasteful number, since it uses less digits than its factorization.

19397994008 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2424749257 (or 2424749253 counting only the distinct ones).

The product of its (nonzero) digits is 4408992, while the sum is 59.

The spelling of 19397994008 in words is "nineteen billion, three hundred ninety-seven million, nine hundred ninety-four thousand, eight".