165450390 has 64 divisors (see below), whose sum is σ = 455970816. Its totient is φ = 37636992.

The previous prime is 165450371. The next prime is 165450413. The reversal of 165450390 is 93054561.

It is a happy number.

165450390 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-3 number, since 3×165450390³ (a number of 26 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 45064 + ... + 48596.

It is an arithmetic number, because the mean of its divisors is an integer number (7124544).

Almost surely, 2^165450390 is an apocalyptic number.

165450390 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 165450390, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (227985408).

165450390 is an abundant number, since it is smaller than the sum of its proper divisors (290520426).

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

165450390 is a wasteful number, since it uses less digits than its factorization.

165450390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3773.

The product of its (nonzero) digits is 16200, while the sum is 33.

The square root of 165450390 is about 12862.7520383470. The cubic root of 165450390 is about 548.9792527685.

The spelling of 165450390 in words is "one hundred sixty-five million, four hundred fifty thousand, three hundred ninety".