999983869 has 2 divisors, whose sum is σ = 999983870. Its totient is φ = 999983868.

The previous prime is 999983839. The next prime is 999983893. The reversal of 999983869 is 968389999.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 737122500 + 262861369 = 27150^2 + 16213^2 .

It is a cyclic number.

It is not a de Polignac number, because 999983869 - 2¹³ = 999975677 is a prime.

It is a super-2 number, since 2×999983869² = 1999935476520418322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 999983798 and 999983807.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (999983819) 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, 499991934 + 499991935.

It is an arithmetic number, because the mean of its divisors is an integer number (499991935).

Almost surely, 2^999983869 is an apocalyptic number.

It is an amenable number.

999983869 is a deficient number, since it is larger than the sum of its proper divisors (1).

999983869 is an equidigital number, since it uses as much as digits as its factorization.

999983869 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 68024448, while the sum is 70.

The square root of 999983869 is about 31622.5215471505. The cubic root of 999983869 is about 999.9946229711.

The spelling of 999983869 in words is "nine hundred ninety-nine million, nine hundred eighty-three thousand, eight hundred sixty-nine".