19942429789 has 2 divisors, whose sum is σ = 19942429790. Its totient is φ = 19942429788.

The previous prime is 19942429747. The next prime is 19942429817. The reversal of 19942429789 is 98792424991.

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., 19745027289 + 197402500 = 140517^2 + 14050^2 .

It is a cyclic number.

It is not a de Polignac number, because 19942429789 - 2²¹ = 19940332637 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 19942429789.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19942429489) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9971214894 + 9971214895.

It is an arithmetic number, because the mean of its divisors is an integer number (9971214895).

Almost surely, 2^19942429789 is an apocalyptic number.

It is an amenable number.

19942429789 is a deficient number, since it is larger than the sum of its proper divisors (1).

19942429789 is an equidigital number, since it uses as much as digits as its factorization.

19942429789 is an evil number, because the sum of its binary digits is even.

The product of its digits is 23514624, while the sum is 64.

The spelling of 19942429789 in words is "nineteen billion, nine hundred forty-two million, four hundred twenty-nine thousand, seven hundred eighty-nine".