189251907 has 16 divisors (see below), whose sum is σ = 272794368. Its totient is φ = 116013600.

The previous prime is 189251893. The next prime is 189251917. The reversal of 189251907 is 709152981.

It is not a de Polignac number, because 189251907 - 2¹² = 189247811 is a prime.

It is not an unprimeable number, because it can be changed into a prime (189251917) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1032 + ... + 19482.

It is an arithmetic number, because the mean of its divisors is an integer number (17049648).

Almost surely, 2^189251907 is an apocalyptic number.

189251907 is a deficient number, since it is larger than the sum of its proper divisors (83542461).

189251907 is a wasteful number, since it uses less digits than its factorization.

189251907 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18730.

The product of its (nonzero) digits is 45360, while the sum is 42.

The square root of 189251907 is about 13756.8858031169. The cubic root of 189251907 is about 574.1342050030.

The spelling of 189251907 in words is "one hundred eighty-nine million, two hundred fifty-one thousand, nine hundred seven".