19130987 has 4 divisors (see below), whose sum is σ = 19268760. Its totient is φ = 18993216.

The previous prime is 19130959. The next prime is 19131017. The reversal of 19130987 is 78903191.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 78903191 = 107 ⋅737413.

It is a cyclic number.

It is not a de Polignac number, because 19130987 - 2⁸ = 19130731 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 19130987.

It is not an unprimeable number, because it can be changed into a prime (19130957) 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, 68678 + ... + 68955.

It is an arithmetic number, because the mean of its divisors is an integer number (4817190).

Almost surely, 2^19130987 is an apocalyptic number.

19130987 is a deficient number, since it is larger than the sum of its proper divisors (137773).

19130987 is a wasteful number, since it uses less digits than its factorization.

19130987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137772.

The product of its (nonzero) digits is 13608, while the sum is 38.

The square root of 19130987 is about 4373.8983755913. The cubic root of 19130987 is about 267.4519644728.

The spelling of 19130987 in words is "nineteen million, one hundred thirty thousand, nine hundred eighty-seven".