19709309894 has 8 divisors (see below), whose sum is σ = 29980358928. Its totient is φ = 9715856920.

The previous prime is 19709309831. The next prime is 19709309903. The reversal of 19709309894 is 49890390791.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 69398837 + ... + 69399120.

It is an arithmetic number, because the mean of its divisors is an integer number (3747544866).

Almost surely, 2^19709309894 is an apocalyptic number.

19709309894 is a deficient number, since it is larger than the sum of its proper divisors (10271049034).

19709309894 is a wasteful number, since it uses less digits than its factorization.

19709309894 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138798030.

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

The spelling of 19709309894 in words is "nineteen billion, seven hundred nine million, three hundred nine thousand, eight hundred ninety-four".