19988135 has 8 divisors (see below), whose sum is σ = 24210576. Its totient is φ = 15840640.

The previous prime is 19988131. The next prime is 19988153. The reversal of 19988135 is 53188991.

It is a happy number.

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

It is not a de Polignac number, because 19988135 - 2² = 19988131 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 (19988131) 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, 18146 + ... + 19215.

It is an arithmetic number, because the mean of its divisors is an integer number (3026322).

Almost surely, 2^19988135 is an apocalyptic number.

19988135 is a deficient number, since it is larger than the sum of its proper divisors (4222441).

19988135 is a wasteful number, since it uses less digits than its factorization.

19988135 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37473.

The product of its digits is 77760, while the sum is 44.

The square root of 19988135 is about 4470.8092108700. The cubic root of 19988135 is about 271.3880734329.

The spelling of 19988135 in words is "nineteen million, nine hundred eighty-eight thousand, one hundred thirty-five".