19913893 has 4 divisors (see below), whose sum is σ = 19987648. Its totient is φ = 19840140.

The previous prime is 19913879. The next prime is 19913897. The reversal of 19913893 is 39831991.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 19913893 - 2¹³ = 19905701 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 (19913897) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36471 + ... + 37012.

It is an arithmetic number, because the mean of its divisors is an integer number (4996912).

Almost surely, 2^19913893 is an apocalyptic number.

It is an amenable number.

19913893 is a deficient number, since it is larger than the sum of its proper divisors (73755).

19913893 is an equidigital number, since it uses as much as digits as its factorization.

19913893 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73754.

The product of its digits is 52488, while the sum is 43.

The square root of 19913893 is about 4462.4985154059. The cubic root of 19913893 is about 271.0516506717.

The spelling of 19913893 in words is "nineteen million, nine hundred thirteen thousand, eight hundred ninety-three".