189911560 has 32 divisors (see below), whose sum is σ = 434548800. Its totient is φ = 74676160.

The previous prime is 189911531. The next prime is 189911563. The reversal of 189911560 is 65119981.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is not an unprimeable number, because it can be changed into a prime (189911563) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37876 + ... + 42595.

It is an arithmetic number, because the mean of its divisors is an integer number (13579650).

Almost surely, 2^189911560 is an apocalyptic number.

189911560 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

189911560 is an abundant number, since it is smaller than the sum of its proper divisors (244637240).

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

189911560 is a wasteful number, since it uses less digits than its factorization.

189911560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80541 (or 80537 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 40.

The square root of 189911560 is about 13780.8403227089. The cubic root of 189911560 is about 574.8004953742.

The spelling of 189911560 in words is "one hundred eighty-nine million, nine hundred eleven thousand, five hundred sixty".