165939228 has 144 divisors (see below), whose sum is σ = 530595520. Its totient is φ = 42581376.

The previous prime is 165939209. The next prime is 165939229. The reversal of 165939228 is 822939561.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165939229) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 4484826 + ... + 4484862.

Almost surely, 2^165939228 is an apocalyptic number.

165939228 is a gapful number since it is divisible by the number (18) 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 165939228, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (265297760).

165939228 is an abundant number, since it is smaller than the sum of its proper divisors (364656292).

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

165939228 is a wasteful number, since it uses less digits than its factorization.

165939228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141 (or 62 counting only the distinct ones).

The product of its digits is 233280, while the sum is 45.

The square root of 165939228 is about 12881.7400998468. The cubic root of 165939228 is about 549.5193906172.

The spelling of 165939228 in words is "one hundred sixty-five million, nine hundred thirty-nine thousand, two hundred twenty-eight".