19885493 has 4 divisors (see below), whose sum is σ = 19894560. Its totient is φ = 19876428.

The previous prime is 19885483. The next prime is 19885499. The reversal of 19885493 is 39458891.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 19885493 - 2⁶ = 19885429 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19885499) 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, 1046 + ... + 6392.

It is an arithmetic number, because the mean of its divisors is an integer number (4973640).

Almost surely, 2^19885493 is an apocalyptic number.

It is an amenable number.

19885493 is a deficient number, since it is larger than the sum of its proper divisors (9067).

19885493 is an equidigital number, since it uses as much as digits as its factorization.

19885493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9066.

The product of its digits is 311040, while the sum is 47.

The square root of 19885493 is about 4459.3153061877. The cubic root of 19885493 is about 270.9227368326.

The spelling of 19885493 in words is "nineteen million, eight hundred eighty-five thousand, four hundred ninety-three".