189747999 has 48 divisors (see below), whose sum is σ = 346125312. Its totient is φ = 97599744.

The previous prime is 189747991. The next prime is 189748001. The reversal of 189747999 is 999747981.

It is not a de Polignac number, because 189747999 - 2³ = 189747991 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189747991) by changing a digit.

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 47 ways as a sum of consecutive naturals, for example, 20782 + ... + 28484.

It is an arithmetic number, because the mean of its divisors is an integer number (7210944).

Almost surely, 2^189747999 is an apocalyptic number.

189747999 is a deficient number, since it is larger than the sum of its proper divisors (156377313).

189747999 is a wasteful number, since it uses less digits than its factorization.

189747999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7756 (or 7753 counting only the distinct ones).

The product of its digits is 10287648, while the sum is 63.

The square root of 189747999 is about 13774.9046820659. The cubic root of 189747999 is about 574.6354326703.

The spelling of 189747999 in words is "one hundred eighty-nine million, seven hundred forty-seven thousand, nine hundred ninety-nine".