999968429 has 2 divisors, whose sum is σ = 999968430. Its totient is φ = 999968428.

The previous prime is 999968399. The next prime is 999968449. The reversal of 999968429 is 924869999.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 836077225 + 163891204 = 28915^2 + 12802^2 .

It is a cyclic number.

It is not a de Polignac number, because 999968429 - 2⁸ = 999968173 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (999968449) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499984214 + 499984215.

It is an arithmetic number, because the mean of its divisors is an integer number (499984215).

Almost surely, 2^999968429 is an apocalyptic number.

It is an amenable number.

999968429 is a deficient number, since it is larger than the sum of its proper divisors (1).

999968429 is an equidigital number, since it uses as much as digits as its factorization.

999968429 is an evil number, because the sum of its binary digits is even.

The product of its digits is 22674816, while the sum is 65.

The square root of 999968429 is about 31622.2774164038. The cubic root of 999968429 is about 999.9894762226.

The spelling of 999968429 in words is "nine hundred ninety-nine million, nine hundred sixty-eight thousand, four hundred twenty-nine".