19982287 has 4 divisors (see below), whose sum is σ = 21519400. Its totient is φ = 18445176.

The previous prime is 19982279. The next prime is 19982317. The reversal of 19982287 is 78228991.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 78228991 = 2399 ⋅32609.

It is a cyclic number.

It is not a de Polignac number, because 19982287 - 2³ = 19982279 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19982267) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 768537 + ... + 768562.

It is an arithmetic number, because the mean of its divisors is an integer number (5379850).

Almost surely, 2^19982287 is an apocalyptic number.

19982287 is a deficient number, since it is larger than the sum of its proper divisors (1537113).

19982287 is a wasteful number, since it uses less digits than its factorization.

19982287 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1537112.

The product of its digits is 145152, while the sum is 46.

The square root of 19982287 is about 4470.1551427216. The cubic root of 19982287 is about 271.3616038588.

The spelling of 19982287 in words is "nineteen million, nine hundred eighty-two thousand, two hundred eighty-seven".