19890671 has 2 divisors, whose sum is σ = 19890672. Its totient is φ = 19890670.

The previous prime is 19890649. The next prime is 19890677. The reversal of 19890671 is 17609891.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 19890671 - 2¹⁰ = 19889647 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19890677) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9945335 + 9945336.

It is an arithmetic number, because the mean of its divisors is an integer number (9945336).

Almost surely, 2^19890671 is an apocalyptic number.

19890671 is a deficient number, since it is larger than the sum of its proper divisors (1).

19890671 is an equidigital number, since it uses as much as digits as its factorization.

19890671 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 27216, while the sum is 41.

The square root of 19890671 is about 4459.8958508019. The cubic root of 19890671 is about 270.9462500572.

The spelling of 19890671 in words is "nineteen million, eight hundred ninety thousand, six hundred seventy-one".