19964149 has 2 divisors, whose sum is σ = 19964150. Its totient is φ = 19964148.

The previous prime is 19964129. The next prime is 19964159. The reversal of 19964149 is 94146991.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18861649 + 1102500 = 4343^2 + 1050^2 .

It is a cyclic number.

It is not a de Polignac number, because 19964149 - 2⁹ = 19963637 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19964129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9982074 + 9982075.

It is an arithmetic number, because the mean of its divisors is an integer number (9982075).

Almost surely, 2^19964149 is an apocalyptic number.

It is an amenable number.

19964149 is a deficient number, since it is larger than the sum of its proper divisors (1).

19964149 is an equidigital number, since it uses as much as digits as its factorization.

19964149 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 69984, while the sum is 43.

The square root of 19964149 is about 4468.1258934815. The cubic root of 19964149 is about 271.2794736744.

The spelling of 19964149 in words is "nineteen million, nine hundred sixty-four thousand, one hundred forty-nine".