19682639 has 2 divisors, whose sum is σ = 19682640. Its totient is φ = 19682638.

The previous prime is 19682633. The next prime is 19682647. The reversal of 19682639 is 93628691.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 19682639 - 2⁴ = 19682623 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 19682639.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19682633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9841319 + 9841320.

It is an arithmetic number, because the mean of its divisors is an integer number (9841320).

Almost surely, 2^19682639 is an apocalyptic number.

19682639 is a deficient number, since it is larger than the sum of its proper divisors (1).

19682639 is an equidigital number, since it uses as much as digits as its factorization.

19682639 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 139968, while the sum is 44.

The square root of 19682639 is about 4436.5120308639. The cubic root of 19682639 is about 269.9983493269.

The spelling of 19682639 in words is "nineteen million, six hundred eighty-two thousand, six hundred thirty-nine".