189903889 has 8 divisors (see below), whose sum is σ = 229799808. Its totient is φ = 153199680.

The previous prime is 189903877. The next prime is 189903899. The reversal of 189903889 is 988309981.

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 189903889 - 2⁹ = 189903377 is a prime.

It is not an unprimeable number, because it can be changed into a prime (189903809) 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, 797797 + ... + 798034.

It is an arithmetic number, because the mean of its divisors is an integer number (28724976).

Almost surely, 2^189903889 is an apocalyptic number.

It is an amenable number.

189903889 is a deficient number, since it is larger than the sum of its proper divisors (39895919).

189903889 is a wasteful number, since it uses less digits than its factorization.

189903889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1595855.

The product of its (nonzero) digits is 1119744, while the sum is 55.

The square root of 189903889 is about 13780.5619986995. The cubic root of 189903889 is about 574.7927560631.

The spelling of 189903889 in words is "one hundred eighty-nine million, nine hundred three thousand, eight hundred eighty-nine".