1987508947 has 8 divisors (see below), whose sum is σ = 2105068176. Its totient is φ = 1870021632.

The previous prime is 1987508923. The next prime is 1987509011. The reversal of 1987508947 is 7498057891.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1987508947 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1987508891 and 1987508900.

It is not an unprimeable number, because it can be changed into a prime (1987508647) 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, 45328 + ... + 77650.

It is an arithmetic number, because the mean of its divisors is an integer number (263133522).

Almost surely, 2^1987508947 is an apocalyptic number.

1987508947 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

1987508947 is a deficient number, since it is larger than the sum of its proper divisors (117559229).

1987508947 is a wasteful number, since it uses less digits than its factorization.

1987508947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35957.

The product of its (nonzero) digits is 5080320, while the sum is 58.

The square root of 1987508947 is about 44581.4865947738. The cubic root of 1987508947 is about 1257.2926135185.

The spelling of 1987508947 in words is "one billion, nine hundred eighty-seven million, five hundred eight thousand, nine hundred forty-seven".