189658644 has 96 divisors (see below), whose sum is σ = 534159360. Its totient is φ = 51203328.

The previous prime is 189658643. The next prime is 189658657. The reversal of 189658644 is 446856981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189658643) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 171397 + ... + 172499.

It is an arithmetic number, because the mean of its divisors is an integer number (5564160).

Almost surely, 2^189658644 is an apocalyptic number.

189658644 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 189658644, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (267079680).

189658644 is an abundant number, since it is smaller than the sum of its proper divisors (344500716).

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

189658644 is a wasteful number, since it uses less digits than its factorization.

189658644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1229 (or 1227 counting only the distinct ones).

The product of its digits is 1658880, while the sum is 51.

The square root of 189658644 is about 13771.6609020118. The cubic root of 189658644 is about 574.5452172066.

The spelling of 189658644 in words is "one hundred eighty-nine million, six hundred fifty-eight thousand, six hundred forty-four".