189618 has 48 divisors (see below), whose sum is σ = 474336. Its totient is φ = 49920.

The previous prime is 189617. The next prime is 189619. The reversal of 189618 is 816981.

189618 is nontrivially palindromic in base 15.

189618 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (189617) and next prime (189619).

It is a Harshad number since it is a multiple of its sum of digits (33).

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189613) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11146 + ... + 11162.

It is an arithmetic number, because the mean of its divisors is an integer number (9882).

2¹⁸⁹⁶¹⁸ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 189618, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (237168).

189618 is an abundant number, since it is smaller than the sum of its proper divisors (284718).

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

189618 is a wasteful number, since it uses less digits than its factorization.

189618 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59 (or 46 counting only the distinct ones).

The product of its digits is 3456, while the sum is 33.

The square root of 189618 is about 435.4514898355. The cubic root of 189618 is about 57.4504172440.

The spelling of 189618 in words is "one hundred eighty-nine thousand, six hundred eighteen".