19706989 has 2 divisors, whose sum is σ = 19706990. Its totient is φ = 19706988.

The previous prime is 19706963. The next prime is 19706993. The reversal of 19706989 is 98960791.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17288964 + 2418025 = 4158^2 + 1555^2 .

It is a cyclic number.

It is not a de Polignac number, because 19706989 - 2¹¹ = 19704941 is a prime.

It is a super-2 number, since 2×19706989² = 776730830892242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19706909) 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, 9853494 + 9853495.

It is an arithmetic number, because the mean of its divisors is an integer number (9853495).

Almost surely, 2^19706989 is an apocalyptic number.

It is an amenable number.

19706989 is a deficient number, since it is larger than the sum of its proper divisors (1).

19706989 is an equidigital number, since it uses as much as digits as its factorization.

19706989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 244944, while the sum is 49.

The square root of 19706989 is about 4439.2554555916. The cubic root of 19706989 is about 270.1096445401.

The spelling of 19706989 in words is "nineteen million, seven hundred six thousand, nine hundred eighty-nine".