189812506 has 8 divisors (see below), whose sum is σ = 306620244. Its totient is φ = 87605760.

The previous prime is 189812501. The next prime is 189812507. The reversal of 189812506 is 605218981.

It can be written as a sum of positive squares in 2 ways, for example, as 184009225 + 5803281 = 13565^2 + 2409^2 .

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

It is not an unprimeable number, because it can be changed into a prime (189812501) 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, 3650215 + ... + 3650266.

Almost surely, 2^189812506 is an apocalyptic number.

189812506 is a deficient number, since it is larger than the sum of its proper divisors (116807738).

189812506 is a wasteful number, since it uses less digits than its factorization.

189812506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7300496.

The product of its (nonzero) digits is 34560, while the sum is 40.

The square root of 189812506 is about 13777.2459512052. The cubic root of 189812506 is about 574.7005432525.

The spelling of 189812506 in words is "one hundred eighty-nine million, eight hundred twelve thousand, five hundred six".