169990987 has 8 divisors (see below), whose sum is σ = 174750752. Its totient is φ = 165240000.

The previous prime is 169990943. The next prime is 169991009. The reversal of 169990987 is 789099961.

169990987 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 169990987 - 2¹¹ = 169988939 is a prime.

It is a super-2 number, since 2×169990987² = 57793871322468338, which contains 22 as substring.

It is a Duffinian number.

It is a nialpdrome in base 15.

It is not an unprimeable number, because it can be changed into a prime (169990937) 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, 65362 + ... + 67912.

It is an arithmetic number, because the mean of its divisors is an integer number (21843844).

Almost surely, 2^169990987 is an apocalyptic number.

169990987 is a deficient number, since it is larger than the sum of its proper divisors (4759765).

169990987 is a wasteful number, since it uses less digits than its factorization.

169990987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4389.

The product of its (nonzero) digits is 2204496, while the sum is 58.

The square root of 169990987 is about 13038.0591730518. The cubic root of 169990987 is about 553.9560355142.

The spelling of 169990987 in words is "one hundred sixty-nine million, nine hundred ninety thousand, nine hundred eighty-seven".