19403972369 has 2 divisors, whose sum is σ = 19403972370. Its totient is φ = 19403972368.

The previous prime is 19403972351. The next prime is 19403972387. The reversal of 19403972369 is 96327930491.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (19403972351) and next prime (19403972387).

It can be written as a sum of positive squares in only one way, i.e., 13735840000 + 5668132369 = 117200^2 + 75287^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19403972369 is a prime.

It is a super-2 number, since 2×19403972369² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 19403972369.

It is not a weakly prime, because it can be changed into another prime (19403978369) 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, 9701986184 + 9701986185.

It is an arithmetic number, because the mean of its divisors is an integer number (9701986185).

Almost surely, 2^19403972369 is an apocalyptic number.

It is an amenable number.

19403972369 is a deficient number, since it is larger than the sum of its proper divisors (1).

19403972369 is an equidigital number, since it uses as much as digits as its factorization.

19403972369 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2204496, while the sum is 53.

The spelling of 19403972369 in words is "nineteen billion, four hundred three million, nine hundred seventy-two thousand, three hundred sixty-nine".