999393869 has 2 divisors, whose sum is σ = 999393870. Its totient is φ = 999393868.

The previous prime is 999393851. The next prime is 999393883. The reversal of 999393869 is 968393999.

999393869 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 999381769 + 12100 = 31613^2 + 110^2 .

It is an emirp because it is prime and its reverse (968393999) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 999393869 - 2¹² = 999389773 is a prime.

It is a super-2 number, since 2×999393869² = 1997576210789578322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (999353869) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499696934 + 499696935.

It is an arithmetic number, because the mean of its divisors is an integer number (499696935).

Almost surely, 2^999393869 is an apocalyptic number.

It is an amenable number.

999393869 is a deficient number, since it is larger than the sum of its proper divisors (1).

999393869 is an equidigital number, since it uses as much as digits as its factorization.

999393869 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 25509168, while the sum is 65.

The square root of 999393869 is about 31613.1913763859. The cubic root of 999393869 is about 999.7979154979.

The spelling of 999393869 in words is "nine hundred ninety-nine million, three hundred ninety-three thousand, eight hundred sixty-nine".