189987827 has 2 divisors, whose sum is σ = 189987828. Its totient is φ = 189987826.

The previous prime is 189987823. The next prime is 189987851. The reversal of 189987827 is 728789981.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 189987827 - 2² = 189987823 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (189987823) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94993913 + 94993914.

It is an arithmetic number, because the mean of its divisors is an integer number (94993914).

Almost surely, 2^189987827 is an apocalyptic number.

189987827 is a deficient number, since it is larger than the sum of its proper divisors (1).

189987827 is an equidigital number, since it uses as much as digits as its factorization.

189987827 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4064256, while the sum is 59.

The square root of 189987827 is about 13783.6071838978. The cubic root of 189987827 is about 574.8774302070.

The spelling of 189987827 in words is "one hundred eighty-nine million, nine hundred eighty-seven thousand, eight hundred twenty-seven".