189008039556 has 144 divisors (see below), whose sum is σ = 549879273216. Its totient is φ = 53621644032.

The previous prime is 189008039501. The next prime is 189008039557. The reversal of 189008039556 is 655930800981.

It is a happy number.

189008039556 is a `hidden beast` number, since 1 + 8 + 9 + 0 + 0 + 80 + 3 + 9 + 556 = 666.

It is not an unprimeable number, because it can be changed into a prime (189008039557) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 53739510 + ... + 53743026.

It is an arithmetic number, because the mean of its divisors is an integer number (3818606064).

Almost surely, 2^189008039556 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 189008039556, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (274939636608).

189008039556 is an abundant number, since it is smaller than the sum of its proper divisors (360871233660).

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

189008039556 is a wasteful number, since it uses less digits than its factorization.

189008039556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4978 (or 4973 counting only the distinct ones).

The product of its (nonzero) digits is 2332800, while the sum is 54.

The spelling of 189008039556 in words is "one hundred eighty-nine billion, eight million, thirty-nine thousand, five hundred fifty-six".