189507138 has 8 divisors (see below), whose sum is σ = 379014288. Its totient is φ = 63169044.

The previous prime is 189507137. The next prime is 189507139. The reversal of 189507138 is 831705981.

It is an interprime number because it is at equal distance from previous prime (189507137) and next prime (189507139).

It is a sphenic number, since it is the product of 3 distinct primes.

189507138 is an admirable number.

It is a self number, because there is not a number n which added to its sum of digits gives 189507138.

It is not an unprimeable number, because it can be changed into a prime (189507133) 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 3 ways as a sum of consecutive naturals, for example, 15792256 + ... + 15792267.

It is an arithmetic number, because the mean of its divisors is an integer number (47376786).

Almost surely, 2^189507138 is an apocalyptic number.

189507138 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

189507138 is a wasteful number, since it uses less digits than its factorization.

189507138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31584528.

The product of its (nonzero) digits is 60480, while the sum is 42.

The square root of 189507138 is about 13766.1591593298. The cubic root of 189507138 is about 574.3921874705.

The spelling of 189507138 in words is "one hundred eighty-nine million, five hundred seven thousand, one hundred thirty-eight".