189120926540 has 384 divisors, whose sum is σ = 534287093760. Its totient is φ = 54582054912.

The previous prime is 189120926539. The next prime is 189120926567. The reversal of 189120926540 is 45629021981.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 100756082 + ... + 100757958.

It is an arithmetic number, because the mean of its divisors is an integer number (1391372640).

Almost surely, 2^189120926540 is an apocalyptic number.

189120926540 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 189120926540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (267143546880).

189120926540 is an abundant number, since it is smaller than the sum of its proper divisors (345166167220).

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

189120926540 is a wasteful number, since it uses less digits than its factorization.

189120926540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2041 (or 2039 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 47.

The spelling of 189120926540 in words is "one hundred eighty-nine billion, one hundred twenty million, nine hundred twenty-six thousand, five hundred forty".