19993193 has 6 divisors (see below), whose sum is σ = 21976122. Its totient is φ = 18175520.

The previous prime is 19993157. The next prime is 19993201. The reversal of 19993193 is 39139991.

It can be written as a sum of positive squares in only one way, i.e., 17197609 + 2795584 = 4147^2 + 1672^2 .

It is not a de Polignac number, because 19993193 - 2⁸ = 19992937 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19999193) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 82496 + ... + 82737.

It is an arithmetic number, because the mean of its divisors is an integer number (3662687).

Almost surely, 2^19993193 is an apocalyptic number.

It is an amenable number.

19993193 is a deficient number, since it is larger than the sum of its proper divisors (1982929).

19993193 is a wasteful number, since it uses less digits than its factorization.

19993193 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165255 (or 165244 counting only the distinct ones).

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

The square root of 19993193 is about 4471.3748444969. The cubic root of 19993193 is about 271.4109630973.

The spelling of 19993193 in words is "nineteen million, nine hundred ninety-three thousand, one hundred ninety-three".