1987187613 has 8 divisors (see below), whose sum is σ = 2805441408. Its totient is φ = 1246862784.

The previous prime is 1987187593. The next prime is 1987187617. The reversal of 1987187613 is 3167817891.

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

It is not a de Polignac number, because 1987187613 - 2⁸ = 1987187357 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (51), and also a Moran number because the ratio is a prime number: 38964463 = 1987187613 / (1 + 9 + 8 + 7 + 1 + 8 + 7 + 6 + 1 + 3).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1987187617) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19482181 + ... + 19482282.

It is an arithmetic number, because the mean of its divisors is an integer number (350680176).

Almost surely, 2^1987187613 is an apocalyptic number.

It is an amenable number.

1987187613 is a deficient number, since it is larger than the sum of its proper divisors (818253795).

1987187613 is a wasteful number, since it uses less digits than its factorization.

1987187613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38964483.

The product of its digits is 508032, while the sum is 51.

The square root of 1987187613 is about 44577.8825540200. The cubic root of 1987187613 is about 1257.2248515360.

The spelling of 1987187613 in words is "one billion, nine hundred eighty-seven million, one hundred eighty-seven thousand, six hundred thirteen".