165399930 has 96 divisors (see below), whose sum is σ = 446434560. Its totient is φ = 42456960.

The previous prime is 165399917. The next prime is 165399931. The reversal of 165399930 is 39993561.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (165399931) 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, 305460 + ... + 306000.

It is an arithmetic number, because the mean of its divisors is an integer number (4650360).

Almost surely, 2^165399930 is an apocalyptic number.

165399930 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 165399930, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (223217280).

165399930 is an abundant number, since it is smaller than the sum of its proper divisors (281034630).

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

165399930 is a wasteful number, since it uses less digits than its factorization.

165399930 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 676 (or 673 counting only the distinct ones).

The product of its (nonzero) digits is 196830, while the sum is 45.

The square root of 165399930 is about 12860.7904111684. The cubic root of 165399930 is about 548.9234368232.

The spelling of 165399930 in words is "one hundred sixty-five million, three hundred ninety-nine thousand, nine hundred thirty".