19193939 has 8 divisors (see below), whose sum is σ = 19718640. Its totient is φ = 18676000.

The previous prime is 19193921. The next prime is 19194011. The reversal of 19193939 is 93939191.

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

It is a cyclic number.

It is not a de Polignac number, because 19193939 - 2²⁰ = 18145363 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 19193939.

It is not an unprimeable number, because it can be changed into a prime (19193039) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4349 + ... + 7569.

It is an arithmetic number, because the mean of its divisors is an integer number (2464830).

Almost surely, 2^19193939 is an apocalyptic number.

19193939 is a deficient number, since it is larger than the sum of its proper divisors (524701).

19193939 is a wasteful number, since it uses less digits than its factorization.

19193939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3381.

The product of its digits is 59049, while the sum is 44.

The square root of 19193939 is about 4381.0887916133. The cubic root of 19193939 is about 267.7450004486.

The spelling of 19193939 in words is "nineteen million, one hundred ninety-three thousand, nine hundred thirty-nine".