19401229 has 2 divisors, whose sum is σ = 19401230. Its totient is φ = 19401228.

The previous prime is 19401227. The next prime is 19401251. The reversal of 19401229 is 92210491.

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., 10562500 + 8838729 = 3250^2 + 2973^2 .

It is an emirp because it is prime and its reverse (92210491) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 19401229 - 2¹ = 19401227 is a prime.

Together with 19401227, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 19401197 and 19401206.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19401227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9700614 + 9700615.

It is an arithmetic number, because the mean of its divisors is an integer number (9700615).

Almost surely, 2^19401229 is an apocalyptic number.

It is an amenable number.

19401229 is a deficient number, since it is larger than the sum of its proper divisors (1).

19401229 is an equidigital number, since it uses as much as digits as its factorization.

19401229 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1296, while the sum is 28.

The square root of 19401229 is about 4404.6826219377. The cubic root of 19401229 is about 268.7054121811.

The spelling of 19401229 in words is "nineteen million, four hundred one thousand, two hundred twenty-nine".