8169987 has 8 divisors (see below), whose sum is σ = 12449536. Its totient is φ = 4668552.

The previous prime is 8169983. The next prime is 8169989. The reversal of 8169987 is 7899618.

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 8169987 - 2² = 8169983 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8169983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 194503 + ... + 194544.

It is an arithmetic number, because the mean of its divisors is an integer number (1556192).

Almost surely, 2^8169987 is an apocalyptic number.

8169987 is a deficient number, since it is larger than the sum of its proper divisors (4279549).

8169987 is a wasteful number, since it uses less digits than its factorization.

8169987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 389057.

The product of its digits is 217728, while the sum is 48.

The square root of 8169987 is about 2858.3189115282. The cubic root of 8169987 is about 201.4066419320.

The spelling of 8169987 in words is "eight million, one hundred sixty-nine thousand, nine hundred eighty-seven".