19439943026 has 8 divisors (see below), whose sum is σ = 33325616640. Its totient is φ = 8331404148.

The previous prime is 19439943013. The next prime is 19439943031. The reversal of 19439943026 is 62034993491.

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

It is a super-2 number, since 2×19439943026² (a number of 21 digits) contains 22 as substring.

It is a Curzon 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, 694283666 + ... + 694283693.

It is an arithmetic number, because the mean of its divisors is an integer number (4165702080).

Almost surely, 2^19439943026 is an apocalyptic number.

19439943026 is a deficient number, since it is larger than the sum of its proper divisors (13885673614).

19439943026 is a wasteful number, since it uses less digits than its factorization.

19439943026 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1388567368.

The product of its (nonzero) digits is 1259712, while the sum is 50.

The spelling of 19439943026 in words is "nineteen billion, four hundred thirty-nine million, nine hundred forty-three thousand, twenty-six".