169990986 has 32 divisors (see below), whose sum is σ = 390412800. Its totient is φ = 48800880.

The previous prime is 169990943. The next prime is 169991009. The reversal of 169990986 is 689099961.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is a nialpdrome in base 15.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 66526 + ... + 69033.

It is an arithmetic number, because the mean of its divisors is an integer number (12200400).

Almost surely, 2^169990986 is an apocalyptic number.

169990986 is an abundant number, since it is smaller than the sum of its proper divisors (220421814).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

169990986 is a wasteful number, since it uses less digits than its factorization.

169990986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135594.

The product of its (nonzero) digits is 1889568, while the sum is 57.

The square root of 169990986 is about 13038.0591347025. The cubic root of 169990986 is about 553.9560344280.

The spelling of 169990986 in words is "one hundred sixty-nine million, nine hundred ninety thousand, nine hundred eighty-six".