19939391073 has 12 divisors (see below), whose sum is σ = 32915820288. Its totient is φ = 11393937720.

The previous prime is 19939391023. The next prime is 19939391083. The reversal of 19939391073 is 37019393991.

It is not a de Polignac number, because 19939391073 - 2⁶ = 19939391009 is a prime.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (19939391023) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 158249073 + ... + 158249198.

It is an arithmetic number, because the mean of its divisors is an integer number (2742985024).

Almost surely, 2^19939391073 is an apocalyptic number.

It is an amenable number.

19939391073 is a deficient number, since it is larger than the sum of its proper divisors (12976429215).

19939391073 is a wasteful number, since it uses less digits than its factorization.

19939391073 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 316498284 (or 316498281 counting only the distinct ones).

The product of its (nonzero) digits is 1240029, while the sum is 54.

The spelling of 19939391073 in words is "nineteen billion, nine hundred thirty-nine million, three hundred ninety-one thousand, seventy-three".