165043820 has 24 divisors (see below), whose sum is σ = 366980544. Its totient is φ = 62134016.

The previous prime is 165043817. The next prime is 165043829. The reversal of 165043820 is 28340561.

It is not an unprimeable number, because it can be changed into a prime (165043829) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 242372 + ... + 243051.

It is an arithmetic number, because the mean of its divisors is an integer number (15290856).

Almost surely, 2^165043820 is an apocalyptic number.

165043820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

165043820 is an abundant number, since it is smaller than the sum of its proper divisors (201936724).

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

165043820 is a wasteful number, since it uses less digits than its factorization.

165043820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 485449 (or 485447 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 29.

The square root of 165043820 is about 12846.9381566193. The cubic root of 165043820 is about 548.5292053341.

The spelling of 165043820 in words is "one hundred sixty-five million, forty-three thousand, eight hundred twenty".