169989439 has 4 divisors (see below), whose sum is σ = 170621640. Its totient is φ = 169357240.

The previous prime is 169989431. The next prime is 169989473. The reversal of 169989439 is 934989961.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 934989961 = 2083 ⋅448867.

It is a cyclic number.

It is not a de Polignac number, because 169989439 - 2³ = 169989431 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 (169989431) 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, 315697 + ... + 316234.

It is an arithmetic number, because the mean of its divisors is an integer number (42655410).

Almost surely, 2^169989439 is an apocalyptic number.

169989439 is a deficient number, since it is larger than the sum of its proper divisors (632201).

169989439 is an equidigital number, since it uses as much as digits as its factorization.

169989439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 632200.

The product of its digits is 3779136, while the sum is 58.

The square root of 169989439 is about 13037.9998082528. Note that the first 3 decimals coincide. The cubic root of 169989439 is about 553.9543540005.

The spelling of 169989439 in words is "one hundred sixty-nine million, nine hundred eighty-nine thousand, four hundred thirty-nine".