19439999998 has 8 divisors (see below), whose sum is σ = 29162005992. Its totient is φ = 9719331336.

The previous prime is 19439999959. The next prime is 19440000029. The reversal of 19439999998 is 89999993491.

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, 297165 + ... + 356632.

It is an arithmetic number, because the mean of its divisors is an integer number (3645250749).

Almost surely, 2^19439999998 is an apocalyptic number.

19439999998 is a deficient number, since it is larger than the sum of its proper divisors (9722005994).

19439999998 is a wasteful number, since it uses less digits than its factorization.

19439999998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 668666.

The product of its digits is 459165024, while the sum is 79.

The spelling of 19439999998 in words is "nineteen billion, four hundred thirty-nine million, nine hundred ninety-nine thousand, nine hundred ninety-eight".