19982643 has 16 divisors (see below), whose sum is σ = 27419040. Its totient is φ = 12939264.

The previous prime is 19982639. The next prime is 19982657. The reversal of 19982643 is 34628991.

It is not a de Polignac number, because 19982643 - 2² = 19982639 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 19982595 and 19982604.

It is not an unprimeable number, because it can be changed into a prime (19982603) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16755 + ... + 17907.

It is an arithmetic number, because the mean of its divisors is an integer number (1713690).

Almost surely, 2^19982643 is an apocalyptic number.

19982643 is a deficient number, since it is larger than the sum of its proper divisors (7436397).

19982643 is a wasteful number, since it uses less digits than its factorization.

19982643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1318.

The product of its digits is 93312, while the sum is 42.

The square root of 19982643 is about 4470.1949621912. The cubic root of 19982643 is about 271.3632153554.

The spelling of 19982643 in words is "nineteen million, nine hundred eighty-two thousand, six hundred forty-three".