189995839488 has 1560 divisors, whose sum is σ = 759270314880. Its totient is φ = 46820229120.

The previous prime is 189995839471. The next prime is 189995839489. The reversal of 189995839488 is 884938599981.

189995839488 is a `hidden beast` number, since 1 + 89 + 9 + 9 + 58 + 3 + 9 + 488 = 666.

It is a Harshad number since it is a multiple of its sum of digits (81).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189995839489) by changing a digit.

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 119 ways as a sum of consecutive naturals, for example, 6128898033 + ... + 6128898063.

Almost surely, 2^189995839488 is an apocalyptic number.

189995839488 is a gapful number since it is divisible by the number (18) 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 189995839488, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (379635157440).

189995839488 is an abundant number, since it is smaller than the sum of its proper divisors (569274475392).

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

189995839488 is a wasteful number, since it uses less digits than its factorization.

189995839488 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123 (or 85 counting only the distinct ones).

The product of its digits is 1612431360, while the sum is 81.

The spelling of 189995839488 in words is "one hundred eighty-nine billion, nine hundred ninety-five million, eight hundred thirty-nine thousand, four hundred eighty-eight".