169389887 has 4 divisors (see below), whose sum is σ = 179354016. Its totient is φ = 159425760.

The previous prime is 169389877. The next prime is 169389889. The reversal of 169389887 is 788983961.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 788983961 = 15881 ⋅49681.

It is a cyclic number.

It is not a de Polignac number, because 169389887 - 2⁶ = 169389823 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (169389889) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4982039 + ... + 4982072.

It is an arithmetic number, because the mean of its divisors is an integer number (44838504).

Almost surely, 2^169389887 is an apocalyptic number.

169389887 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

169389887 is a deficient number, since it is larger than the sum of its proper divisors (9964129).

169389887 is an equidigital number, since it uses as much as digits as its factorization.

169389887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9964128.

The product of its digits is 5225472, while the sum is 59.

The square root of 169389887 is about 13014.9870149762. The cubic root of 169389887 is about 553.3023219745.

The spelling of 169389887 in words is "one hundred sixty-nine million, three hundred eighty-nine thousand, eight hundred eighty-seven".