189997903922 has 6 divisors (see below), whose sum is σ = 284997780543. Its totient is φ = 94998643742.

The previous prime is 189997903919. The next prime is 189997903951. The reversal of 189997903922 is 229309799981.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 94998951961 + 94998951961 = 308219^2 + 308219^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=308219.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 462329 + ... + 770547.

Almost surely, 2^189997903922 is an apocalyptic number.

189997903922 is a deficient number, since it is larger than the sum of its proper divisors (94999876621).

189997903922 is an frugal number, since it uses more digits than its factorization.

189997903922 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 616440 (or 308221 counting only the distinct ones).

The product of its (nonzero) digits is 39680928, while the sum is 68.

The spelling of 189997903922 in words is "one hundred eighty-nine billion, nine hundred ninety-seven million, nine hundred three thousand, nine hundred twenty-two".