169243789 has 24 divisors (see below), whose sum is σ = 212156280. Its totient is φ = 133647360.

The previous prime is 169243769. The next prime is 169243799. The reversal of 169243789 is 987342961.

It can be written as a sum of positive squares in 4 ways, for example, as 36602500 + 132641289 = 6050^2 + 11517^2 .

It is a de Polignac number, because none of the positive numbers 2^k-169243789 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 (169243769) 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 23 ways as a sum of consecutive naturals, for example, 23577 + ... + 29905.

It is an arithmetic number, because the mean of its divisors is an integer number (8839845).

Almost surely, 2^169243789 is an apocalyptic number.

It is an amenable number.

169243789 is a deficient number, since it is larger than the sum of its proper divisors (42912491).

169243789 is a wasteful number, since it uses less digits than its factorization.

169243789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6381 (or 6370 counting only the distinct ones).

The product of its digits is 653184, while the sum is 49.

The square root of 169243789 is about 13009.3731209463. The cubic root of 169243789 is about 553.1432026482.

The spelling of 169243789 in words is "one hundred sixty-nine million, two hundred forty-three thousand, seven hundred eighty-nine".