189640471 has 2 divisors, whose sum is σ = 189640472. Its totient is φ = 189640470.

The previous prime is 189640453. The next prime is 189640481. The reversal of 189640471 is 174046981.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 189640471 - 2⁷ = 189640343 is a prime.

It is a super-3 number, since 3×189640471³ (a number of 26 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (189640421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94820235 + 94820236.

It is an arithmetic number, because the mean of its divisors is an integer number (94820236).

Almost surely, 2^189640471 is an apocalyptic number.

189640471 is a deficient number, since it is larger than the sum of its proper divisors (1).

189640471 is an equidigital number, since it uses as much as digits as its factorization.

189640471 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48384, while the sum is 40.

The square root of 189640471 is about 13771.0010892455. The cubic root of 189640471 is about 574.5268657384.

The spelling of 189640471 in words is "one hundred eighty-nine million, six hundred forty thousand, four hundred seventy-one".