189698986821 has 8 divisors (see below), whose sum is σ = 252944382880. Its totient is φ = 126459790992.

The previous prime is 189698986727. The next prime is 189698986847. The reversal of 189698986821 is 128689896981.

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

It is not a de Polignac number, because 189698986821 - 2¹⁰ = 189698985797 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 (189698786821) 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, 1478191 + ... + 1601388.

It is an arithmetic number, because the mean of its divisors is an integer number (31618047860).

Almost surely, 2^189698986821 is an apocalyptic number.

It is an amenable number.

189698986821 is a deficient number, since it is larger than the sum of its proper divisors (63245396059).

189698986821 is a wasteful number, since it uses less digits than its factorization.

189698986821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3100115.

The product of its digits is 214990848, while the sum is 75.

The spelling of 189698986821 in words is "one hundred eighty-nine billion, six hundred ninety-eight million, nine hundred eighty-six thousand, eight hundred twenty-one".