19749229 has 2 divisors, whose sum is σ = 19749230. Its totient is φ = 19749228.

The previous prime is 19749199. The next prime is 19749241. The reversal of 19749229 is 92294791.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18688329 + 1060900 = 4323^2 + 1030^2 .

It is a cyclic number.

It is not a de Polignac number, because 19749229 - 2⁷ = 19749101 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19749329) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9874614 + 9874615.

It is an arithmetic number, because the mean of its divisors is an integer number (9874615).

Almost surely, 2^19749229 is an apocalyptic number.

It is an amenable number.

19749229 is a deficient number, since it is larger than the sum of its proper divisors (1).

19749229 is an equidigital number, since it uses as much as digits as its factorization.

19749229 is an evil number, because the sum of its binary digits is even.

The product of its digits is 81648, while the sum is 43.

The square root of 19749229 is about 4444.0104635340. The cubic root of 19749229 is about 270.3024913420.

The spelling of 19749229 in words is "nineteen million, seven hundred forty-nine thousand, two hundred twenty-nine".