19946429 has 2 divisors, whose sum is σ = 19946430. Its totient is φ = 19946428.

The previous prime is 19946419. The next prime is 19946449. The reversal of 19946429 is 92464991.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19598329 + 348100 = 4427^2 + 590^2 .

It is a cyclic number.

It is not a de Polignac number, because 19946429 - 2¹² = 19942333 is a prime.

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 19946429.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19946419) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9973214 + 9973215.

It is an arithmetic number, because the mean of its divisors is an integer number (9973215).

Almost surely, 2^19946429 is an apocalyptic number.

It is an amenable number.

19946429 is a deficient number, since it is larger than the sum of its proper divisors (1).

19946429 is an equidigital number, since it uses as much as digits as its factorization.

19946429 is an evil number, because the sum of its binary digits is even.

The product of its digits is 139968, while the sum is 44.

The square root of 19946429 is about 4466.1425189978. The cubic root of 19946429 is about 271.1991881718.

The spelling of 19946429 in words is "nineteen million, nine hundred forty-six thousand, four hundred twenty-nine".