165890340 has 144 divisors (see below), whose sum is σ = 627419520. Its totient is φ = 34467840.

The previous prime is 165890327. The next prime is 165890341. The reversal of 165890340 is 43098561.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 165890295 and 165890304.

It is not an unprimeable number, because it can be changed into a prime (165890341) 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, 7876 + ... + 19844.

It is an arithmetic number, because the mean of its divisors is an integer number (4357080).

Almost surely, 2^165890340 is an apocalyptic number.

165890340 is a gapful number since it is divisible by the number (10) 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 165890340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (313709760).

165890340 is an abundant number, since it is smaller than the sum of its proper divisors (461529180).

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

165890340 is a wasteful number, since it uses less digits than its factorization.

165890340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12002 (or 11997 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 36.

The square root of 165890340 is about 12879.8423903400. The cubic root of 165890340 is about 549.4654199699.

The spelling of 165890340 in words is "one hundred sixty-five million, eight hundred ninety thousand, three hundred forty".