999947659 has 2 divisors, whose sum is σ = 999947660. Its totient is φ = 999947658.

The previous prime is 999947603. The next prime is 999947723. The reversal of 999947659 is 956749999.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 999947659 - 2⁹ = 999947147 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 999947594 and 999947603.

It is not a weakly prime, because it can be changed into another prime (999947159) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499973829 + 499973830.

It is an arithmetic number, because the mean of its divisors is an integer number (499973830).

Almost surely, 2^999947659 is an apocalyptic number.

999947659 is a deficient number, since it is larger than the sum of its proper divisors (1).

999947659 is an equidigital number, since it uses as much as digits as its factorization.

999947659 is an evil number, because the sum of its binary digits is even.

The product of its digits is 49601160, while the sum is 67.

The square root of 999947659 is about 31621.9490069793. The cubic root of 999947659 is about 999.9825526956.

The spelling of 999947659 in words is "nine hundred ninety-nine million, nine hundred forty-seven thousand, six hundred fifty-nine".