165898 has 8 divisors (see below), whose sum is σ = 251460. Its totient is φ = 82080.

The previous prime is 165887. The next prime is 165901. The reversal of 165898 is 898561.

It can be written as a sum of positive squares in 2 ways, for example, as 154449 + 11449 = 393^2 + 107^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an alternating number because its digits alternate between odd and even.

It is an unprimeable number.

165898 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 163 + ... + 598.

2¹⁶⁵⁸⁹⁸ is an apocalyptic number.

165898 is a deficient number, since it is larger than the sum of its proper divisors (85562).

165898 is a wasteful number, since it uses less digits than its factorization.

165898 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 872.

The product of its digits is 17280, while the sum is 37.

The square root of 165898 is about 407.3057819378. The cubic root of 165898 is about 54.9473877043.

The spelling of 165898 in words is "one hundred sixty-five thousand, eight hundred ninety-eight".