165890190 has 16 divisors (see below), whose sum is σ = 398136528. Its totient is φ = 44237376.

The previous prime is 165890183. The next prime is 165890201. The reversal of 165890190 is 91098561.

It is a super-2 number, since 2×165890190² = 55039110276472200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2764807 + ... + 2764866.

It is an arithmetic number, because the mean of its divisors is an integer number (24883533).

Almost surely, 2^165890190 is an apocalyptic number.

165890190 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

165890190 is an abundant number, since it is smaller than the sum of its proper divisors (232246338).

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

165890190 is a wasteful number, since it uses less digits than its factorization.

165890190 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5529683.

The product of its (nonzero) digits is 19440, while the sum is 39.

The square root of 165890190 is about 12879.8365672861. The cubic root of 165890190 is about 549.4652543588.

The spelling of 165890190 in words is "one hundred sixty-five million, eight hundred ninety thousand, one hundred ninety".