19885429 has 2 divisors, whose sum is σ = 19885430. Its totient is φ = 19885428.

The previous prime is 19885423. The next prime is 19885433. The reversal of 19885429 is 92458891.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18190225 + 1695204 = 4265^2 + 1302^2 .

It is a cyclic number.

It is not a de Polignac number, because 19885429 - 2¹³ = 19877237 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19885423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9942714 + 9942715.

It is an arithmetic number, because the mean of its divisors is an integer number (9942715).

Almost surely, 2^19885429 is an apocalyptic number.

It is an amenable number.

19885429 is a deficient number, since it is larger than the sum of its proper divisors (1).

19885429 is an equidigital number, since it uses as much as digits as its factorization.

19885429 is an evil number, because the sum of its binary digits is even.

The product of its digits is 207360, while the sum is 46.

The square root of 19885429 is about 4459.3081301924. The cubic root of 19885429 is about 270.9224461840.

The spelling of 19885429 in words is "nineteen million, eight hundred eighty-five thousand, four hundred twenty-nine".