189816903 has 12 divisors (see below), whose sum is σ = 279353880. Its totient is φ = 124156656.

The previous prime is 189816901. The next prime is 189816941. The reversal of 189816903 is 309618981.

It is not a de Polignac number, because 189816903 - 2¹ = 189816901 is a prime.

It is a super-2 number, since 2×189816903² = 72060913329022818, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189816901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 198493 + ... + 199446.

It is an arithmetic number, because the mean of its divisors is an integer number (23279490).

Almost surely, 2^189816903 is an apocalyptic number.

189816903 is a deficient number, since it is larger than the sum of its proper divisors (89536977).

189816903 is a wasteful number, since it uses less digits than its factorization.

189816903 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 397998 (or 397995 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 45.

The square root of 189816903 is about 13777.4055249891. The cubic root of 189816903 is about 574.7049808575.

The spelling of 189816903 in words is "one hundred eighty-nine million, eight hundred sixteen thousand, nine hundred three".