19881093 has 16 divisors (see below), whose sum is σ = 27283520. Its totient is φ = 12870144.

The previous prime is 19881079. The next prime is 19881097. The reversal of 19881093 is 39018891.

It is a happy number.

It is not a de Polignac number, because 19881093 - 2⁴ = 19881077 is a prime.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19881097) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29205 + ... + 29877.

It is an arithmetic number, because the mean of its divisors is an integer number (1705220).

Almost surely, 2^19881093 is an apocalyptic number.

It is an amenable number.

19881093 is a deficient number, since it is larger than the sum of its proper divisors (7402427).

19881093 is a wasteful number, since it uses less digits than its factorization.

19881093 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 948.

The product of its (nonzero) digits is 15552, while the sum is 39.

The square root of 19881093 is about 4458.8219296132. The cubic root of 19881093 is about 270.9027532870.

It can be divided in two parts, 1988 and 1093, that added together give a triangular number (3081 = T₇₈).

The spelling of 19881093 in words is "nineteen million, eight hundred eighty-one thousand, ninety-three".