19772069 has 2 divisors, whose sum is σ = 19772070. Its totient is φ = 19772068.

The previous prime is 19772057. The next prime is 19772149. The reversal of 19772069 is 96027791.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15507844 + 4264225 = 3938^2 + 2065^2 .

It is an emirp because it is prime and its reverse (96027791) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 19772069 - 2⁸ = 19771813 is a prime.

It is a super-2 number, since 2×19772069² = 781869425081522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19772029) 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, 9886034 + 9886035.

It is an arithmetic number, because the mean of its divisors is an integer number (9886035).

Almost surely, 2^19772069 is an apocalyptic number.

It is an amenable number.

19772069 is a deficient number, since it is larger than the sum of its proper divisors (1).

19772069 is an equidigital number, since it uses as much as digits as its factorization.

19772069 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 47628, while the sum is 41.

The square root of 19772069 is about 4446.5794719087. The cubic root of 19772069 is about 270.4066528845.

The spelling of 19772069 in words is "nineteen million, seven hundred seventy-two thousand, sixty-nine".