189139500 has 144 divisors (see below), whose sum is σ = 651085344. Its totient is φ = 45840000.

The previous prime is 189139481. The next prime is 189139529. The reversal of 189139500 is 5931981.

It is a happy number.

189139500 is a `hidden beast` number, since 18 + 9 + 139 + 500 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

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 47 ways as a sum of consecutive naturals, for example, 47590 + ... + 51410.

It is an arithmetic number, because the mean of its divisors is an integer number (4521426).

Almost surely, 2^189139500 is an apocalyptic number.

189139500 is a gapful number since it is divisible by the number (10) 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 189139500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (325542672).

189139500 is an abundant number, since it is smaller than the sum of its proper divisors (461945844).

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

189139500 is a wasteful number, since it uses less digits than its factorization.

189139500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3857 (or 3842 counting only the distinct ones).

The product of its (nonzero) digits is 9720, while the sum is 36.

The square root of 189139500 is about 13752.7997149671. The cubic root of 189139500 is about 574.0205126478.

The spelling of 189139500 in words is "one hundred eighty-nine million, one hundred thirty-nine thousand, five hundred".