189991916 has 12 divisors (see below), whose sum is σ = 332667720. Its totient is φ = 94944000.

The previous prime is 189991903. The next prime is 189991927. The reversal of 189991916 is 619199981.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4085 + ... + 19916.

It is an arithmetic number, because the mean of its divisors is an integer number (27722310).

Almost surely, 2^189991916 is an apocalyptic number.

It is an amenable number.

189991916 is a deficient number, since it is larger than the sum of its proper divisors (142675804).

189991916 is a wasteful number, since it uses less digits than its factorization.

189991916 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25984 (or 25982 counting only the distinct ones).

The product of its digits is 314928, while the sum is 53.

The square root of 189991916 is about 13783.7555114707. The cubic root of 189991916 is about 574.8815544308.

The spelling of 189991916 in words is "one hundred eighty-nine million, nine hundred ninety-one thousand, nine hundred sixteen".