19987195 has 8 divisors (see below), whose sum is σ = 24111360. Its totient is φ = 15905280.

The previous prime is 19987171. The next prime is 19987229. The reversal of 19987195 is 59178991.

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 19987195 - 2¹⁹ = 19462907 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9510 + ... + 11419.

It is an arithmetic number, because the mean of its divisors is an integer number (3013920).

Almost surely, 2^19987195 is an apocalyptic number.

19987195 is a deficient number, since it is larger than the sum of its proper divisors (4124165).

19987195 is a wasteful number, since it uses less digits than its factorization.

19987195 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21125.

The product of its digits is 204120, while the sum is 49.

The square root of 19987195 is about 4470.7040832513. The cubic root of 19987195 is about 271.3838190959.

The spelling of 19987195 in words is "nineteen million, nine hundred eighty-seven thousand, one hundred ninety-five".