189907 has 4 divisors (see below), whose sum is σ = 201096. Its totient is φ = 178720.

The previous prime is 189901. The next prime is 189913. The reversal of 189907 is 709981.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (189901) and next prime (189913).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-189907 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (189901) 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 3 ways as a sum of consecutive naturals, for example, 5569 + ... + 5602.

It is an arithmetic number, because the mean of its divisors is an integer number (50274).

2¹⁸⁹⁹⁰⁷ is an apocalyptic number.

189907 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

189907 is a deficient number, since it is larger than the sum of its proper divisors (11189).

189907 is a wasteful number, since it uses less digits than its factorization.

189907 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11188.

The product of its (nonzero) digits is 4536, while the sum is 34.

The square root of 189907 is about 435.7832029806. The cubic root of 189907 is about 57.4795894792.

The spelling of 189907 in words is "one hundred eighty-nine thousand, nine hundred seven".