189385780 has 24 divisors (see below), whose sum is σ = 421105608. Its totient is φ = 71298048.

The previous prime is 189385741. The next prime is 189385799. The reversal of 189385780 is 87583981.

It can be written as a sum of positive squares in 4 ways, for example, as 94245264 + 95140516 = 9708^2 + 9754^2 .

It is a congruent number.

It is an unprimeable number.

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, 278169 + ... + 278848.

It is an arithmetic number, because the mean of its divisors is an integer number (17546067).

Almost surely, 2^189385780 is an apocalyptic number.

189385780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

189385780 is an abundant number, since it is smaller than the sum of its proper divisors (231719828).

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

189385780 is a wasteful number, since it uses less digits than its factorization.

189385780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 557043 (or 557041 counting only the distinct ones).

The product of its (nonzero) digits is 483840, while the sum is 49.

The square root of 189385780 is about 13761.7506153832. The cubic root of 189385780 is about 574.2695500984.

The spelling of 189385780 in words is "one hundred eighty-nine million, three hundred eighty-five thousand, seven hundred eighty".