19424729 has 2 divisors, whose sum is σ = 19424730. Its totient is φ = 19424728.

The previous prime is 19424723. The next prime is 19424731. The reversal of 19424729 is 92742491.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18705625 + 719104 = 4325^2 + 848^2 .

It is an emirp because it is prime and its reverse (92742491) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19424729 is a prime.

Together with 19424731, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 19424692 and 19424701.

It is not a weakly prime, because it can be changed into another prime (19424723) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9712364 + 9712365.

It is an arithmetic number, because the mean of its divisors is an integer number (9712365).

Almost surely, 2^19424729 is an apocalyptic number.

It is an amenable number.

19424729 is a deficient number, since it is larger than the sum of its proper divisors (1).

19424729 is an equidigital number, since it uses as much as digits as its factorization.

19424729 is an evil number, because the sum of its binary digits is even.

The product of its digits is 36288, while the sum is 38.

The square root of 19424729 is about 4407.3494302131. The cubic root of 19424729 is about 268.8138594236.

The spelling of 19424729 in words is "nineteen million, four hundred twenty-four thousand, seven hundred twenty-nine".