999966427 has 2 divisors, whose sum is σ = 999966428. Its totient is φ = 999966426.

The previous prime is 999966421. The next prime is 999966439. The reversal of 999966427 is 724669999.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 999966427 - 2¹¹ = 999964379 is a prime.

It is not a weakly prime, because it can be changed into another prime (999966421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499983213 + 499983214.

It is an arithmetic number, because the mean of its divisors is an integer number (499983214).

Almost surely, 2^999966427 is an apocalyptic number.

999966427 is a deficient number, since it is larger than the sum of its proper divisors (1).

999966427 is an equidigital number, since it uses as much as digits as its factorization.

999966427 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13226976, while the sum is 61.

The square root of 999966427 is about 31622.2457614889. The cubic root of 999966427 is about 999.9888088748.

The spelling of 999966427 in words is "nine hundred ninety-nine million, nine hundred sixty-six thousand, four hundred twenty-seven".