165398 has 4 divisors (see below), whose sum is σ = 248100. Its totient is φ = 82698.

The previous prime is 165397. The next prime is 165437. The reversal of 165398 is 893561.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 893561 = 223 ⋅4007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41348 + ... + 41351.

It is an arithmetic number, because the mean of its divisors is an integer number (62025).

2¹⁶⁵³⁹⁸ is an apocalyptic number.

165398 is a deficient number, since it is larger than the sum of its proper divisors (82702).

165398 is an equidigital number, since it uses as much as digits as its factorization.

165398 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82701.

The product of its digits is 6480, while the sum is 32.

The square root of 165398 is about 406.6915292946. The cubic root of 165398 is about 54.8921301743.

It can be divided in two parts, 16 and 5398, that multiplied together give a palindrome (86368).

The spelling of 165398 in words is "one hundred sixty-five thousand, three hundred ninety-eight".