19898929 has 2 divisors, whose sum is σ = 19898930. Its totient is φ = 19898928.

The previous prime is 19898917. The next prime is 19898939. The reversal of 19898929 is 92989891.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18792225 + 1106704 = 4335^2 + 1052^2 .

It is an emirp because it is prime and its reverse (92989891) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 19898929 - 2²³ = 11510321 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 19898929.

It is not a weakly prime, because it can be changed into another prime (19898939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9949464 + 9949465.

It is an arithmetic number, because the mean of its divisors is an integer number (9949465).

Almost surely, 2^19898929 is an apocalyptic number.

It is an amenable number.

19898929 is a deficient number, since it is larger than the sum of its proper divisors (1).

19898929 is an equidigital number, since it uses as much as digits as its factorization.

19898929 is an evil number, because the sum of its binary digits is even.

The product of its digits is 839808, while the sum is 55.

The square root of 19898929 is about 4460.8215611028. The cubic root of 19898929 is about 270.9837410760.

The spelling of 19898929 in words is "nineteen million, eight hundred ninety-eight thousand, nine hundred twenty-nine".