19937429 has 2 divisors, whose sum is σ = 19937430. Its totient is φ = 19937428.

The previous prime is 19937419. The next prime is 19937431. The reversal of 19937429 is 92473991.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15816529 + 4120900 = 3977^2 + 2030^2 .

It is a cyclic number.

It is not a de Polignac number, because 19937429 - 2⁸ = 19937173 is a prime.

Together with 19937431, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 19937429.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19937419) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9968714 + 9968715.

It is an arithmetic number, because the mean of its divisors is an integer number (9968715).

Almost surely, 2^19937429 is an apocalyptic number.

It is an amenable number.

19937429 is a deficient number, since it is larger than the sum of its proper divisors (1).

19937429 is an equidigital number, since it uses as much as digits as its factorization.

19937429 is an evil number, because the sum of its binary digits is even.

The product of its digits is 122472, while the sum is 44.

The square root of 19937429 is about 4465.1348243922. The cubic root of 19937429 is about 271.1583929015.

The spelling of 19937429 in words is "nineteen million, nine hundred thirty-seven thousand, four hundred twenty-nine".