999405427 has 2 divisors, whose sum is σ = 999405428. Its totient is φ = 999405426.

The previous prime is 999405397. The next prime is 999405461. The reversal of 999405427 is 724504999.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-999405427 is a prime.

It is a super-2 number, since 2×999405427² = 1997622415034104658, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (999405487) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499702713 + 499702714.

It is an arithmetic number, because the mean of its divisors is an integer number (499702714).

Almost surely, 2^999405427 is an apocalyptic number.

999405427 is a deficient number, since it is larger than the sum of its proper divisors (1).

999405427 is an equidigital number, since it uses as much as digits as its factorization.

999405427 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 816480, while the sum is 49.

The square root of 999405427 is about 31613.3741792932. The cubic root of 999405427 is about 999.8017697073.

The spelling of 999405427 in words is "nine hundred ninety-nine million, four hundred five thousand, four hundred twenty-seven".