189849820 has 24 divisors (see below), whose sum is σ = 416019744. Its totient is φ = 72638016.

The previous prime is 189849809. The next prime is 189849823. The reversal of 189849820 is 28948981.

189849820 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189849823) by changing a digit.

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, 205899 + ... + 206818.

It is an arithmetic number, because the mean of its divisors is an integer number (17334156).

Almost surely, 2^189849820 is an apocalyptic number.

189849820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

189849820 is an abundant number, since it is smaller than the sum of its proper divisors (226169924).

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

189849820 is a wasteful number, since it uses less digits than its factorization.

189849820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 412749 (or 412747 counting only the distinct ones).

The product of its (nonzero) digits is 331776, while the sum is 49.

The square root of 189849820 is about 13778.6000740278. The cubic root of 189849820 is about 574.7381996597.

The spelling of 189849820 in words is "one hundred eighty-nine million, eight hundred forty-nine thousand, eight hundred twenty".