999478457 has 2 divisors, whose sum is σ = 999478458. Its totient is φ = 999478456.

The previous prime is 999478439. The next prime is 999478481. The reversal of 999478457 is 754874999.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 653109136 + 346369321 = 25556^2 + 18611^2 .

It is a cyclic number.

It is not a de Polignac number, because 999478457 - 2⁶ = 999478393 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 999478457.

It is not a weakly prime, because it can be changed into another prime (999478757) 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, 499739228 + 499739229.

It is an arithmetic number, because the mean of its divisors is an integer number (499739229).

Almost surely, 2^999478457 is an apocalyptic number.

It is an amenable number.

999478457 is a deficient number, since it is larger than the sum of its proper divisors (1).

999478457 is an equidigital number, since it uses as much as digits as its factorization.

999478457 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 22861440, while the sum is 62.

The square root of 999478457 is about 31614.5292073123. The cubic root of 999478457 is about 999.8261221016.

The spelling of 999478457 in words is "nine hundred ninety-nine million, four hundred seventy-eight thousand, four hundred fifty-seven".