169239980 has 144 divisors (see below), whose sum is σ = 460422144. Its totient is φ = 51068160.

The previous prime is 169239977. The next prime is 169239989. The reversal of 169239980 is 89932961.

It is not an unprimeable number, because it can be changed into a prime (169239989) by changing a digit.

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 47 ways as a sum of consecutive naturals, for example, 544025 + ... + 544335.

It is an arithmetic number, because the mean of its divisors is an integer number (3197376).

Almost surely, 2^169239980 is an apocalyptic number.

169239980 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 169239980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (230211072).

169239980 is an abundant number, since it is smaller than the sum of its proper divisors (291182164).

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

169239980 is a wasteful number, since it uses less digits than its factorization.

169239980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 376 (or 361 counting only the distinct ones).

The product of its (nonzero) digits is 209952, while the sum is 47.

The square root of 169239980 is about 13009.2267256744. The cubic root of 169239980 is about 553.1390529376.

The spelling of 169239980 in words is "one hundred sixty-nine million, two hundred thirty-nine thousand, nine hundred eighty".