165917939 has 8 divisors (see below), whose sum is σ = 185416560. Its totient is φ = 147155200.

The previous prime is 165917923. The next prime is 165917957. The reversal of 165917939 is 939719561.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 165917939 - 2⁴ = 165917923 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (165917639) 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 7 ways as a sum of consecutive naturals, for example, 183494 + ... + 184395.

It is an arithmetic number, because the mean of its divisors is an integer number (23177070).

Almost surely, 2^165917939 is an apocalyptic number.

165917939 is a deficient number, since it is larger than the sum of its proper divisors (19498621).

165917939 is a wasteful number, since it uses less digits than its factorization.

165917939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 367941.

The product of its digits is 459270, while the sum is 50.

The square root of 165917939 is about 12880.9137486438. The cubic root of 165917939 is about 549.4958896067.

The spelling of 165917939 in words is "one hundred sixty-five million, nine hundred seventeen thousand, nine hundred thirty-nine".