165989000 has 64 divisors (see below), whose sum is σ = 391772160. Its totient is φ = 65822400.

The previous prime is 165988957. The next prime is 165989017. The reversal of 165989000 is 989561.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 126347 + ... + 127653.

It is an arithmetic number, because the mean of its divisors is an integer number (6121440).

Almost surely, 2^165989000 is an apocalyptic number.

165989000 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 165989000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (195886080).

165989000 is an abundant number, since it is smaller than the sum of its proper divisors (225783160).

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

165989000 is a wasteful number, since it uses less digits than its factorization.

165989000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1455 (or 1441 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 38.

The square root of 165989000 is about 12883.6718368639. The cubic root of 165989000 is about 549.5743262813.

The spelling of 165989000 in words is "one hundred sixty-five million, nine hundred eighty-nine thousand".