165390090 has 16 divisors (see below), whose sum is σ = 396936288. Its totient is φ = 44104016.

The previous prime is 165390089. The next prime is 165390091. The reversal of 165390090 is 90093561.

It is an interprime number because it is at equal distance from previous prime (165390089) and next prime (165390091).

It is not an unprimeable number, because it can be changed into a prime (165390091) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2756472 + ... + 2756531.

It is an arithmetic number, because the mean of its divisors is an integer number (24808518).

Almost surely, 2^165390090 is an apocalyptic number.

165390090 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

165390090 is an abundant number, since it is smaller than the sum of its proper divisors (231546198).

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

165390090 is a wasteful number, since it uses less digits than its factorization.

165390090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5513013.

The product of its (nonzero) digits is 7290, while the sum is 33.

The square root of 165390090 is about 12860.4078473429. The cubic root of 165390090 is about 548.9125510594.

The spelling of 165390090 in words is "one hundred sixty-five million, three hundred ninety thousand, ninety".