999478439 has 2 divisors, whose sum is σ = 999478440. Its totient is φ = 999478438.

The previous prime is 999478421. The next prime is 999478457. The reversal of 999478439 is 934874999.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (999478421) and next prime (999478457).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-999478439 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (999478339) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499739219 + 499739220.

It is an arithmetic number, because the mean of its divisors is an integer number (499739220).

Almost surely, 2^999478439 is an apocalyptic number.

999478439 is a deficient number, since it is larger than the sum of its proper divisors (1).

999478439 is an equidigital number, since it uses as much as digits as its factorization.

999478439 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 17635968, while the sum is 62.

The square root of 999478439 is about 31614.5289226330. The cubic root of 999478439 is about 999.8261160995.

The spelling of 999478439 in words is "nine hundred ninety-nine million, four hundred seventy-eight thousand, four hundred thirty-nine".