165434839 has 4 divisors (see below), whose sum is σ = 165486024. Its totient is φ = 165383656.

The previous prime is 165434833. The next prime is 165434861. The reversal of 165434839 is 938434561.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 938434561 = 17 ⋅55202033.

It is a cyclic number.

It is not a de Polignac number, because 165434839 - 2²⁷ = 31217111 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 165434795 and 165434804.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165434833) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20392 + ... + 27325.

It is an arithmetic number, because the mean of its divisors is an integer number (41371506).

Almost surely, 2^165434839 is an apocalyptic number.

165434839 is a deficient number, since it is larger than the sum of its proper divisors (51185).

165434839 is an equidigital number, since it uses as much as digits as its factorization.

165434839 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51184.

The product of its digits is 311040, while the sum is 43.

The square root of 165434839 is about 12862.1475267546. The cubic root of 165434839 is about 548.9620523581.

The spelling of 165434839 in words is "one hundred sixty-five million, four hundred thirty-four thousand, eight hundred thirty-nine".