189981028693 has 8 divisors (see below), whose sum is σ = 201213936000. Its totient is φ = 178754516160.

The previous prime is 189981028681. The next prime is 189981028697. The reversal of 189981028693 is 396820189981.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 189981028693 - 2⁵ = 189981028661 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189981028697) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1537453 + ... + 1656418.

It is an arithmetic number, because the mean of its divisors is an integer number (25151742000).

Almost surely, 2^189981028693 is an apocalyptic number.

It is an amenable number.

189981028693 is a deficient number, since it is larger than the sum of its proper divisors (11232907307).

189981028693 is a wasteful number, since it uses less digits than its factorization.

189981028693 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3197387.

The product of its (nonzero) digits is 13436928, while the sum is 64.

The spelling of 189981028693 in words is "one hundred eighty-nine billion, nine hundred eighty-one million, twenty-eight thousand, six hundred ninety-three".