999784469 has 2 divisors, whose sum is σ = 999784470. Its totient is φ = 999784468.

The previous prime is 999784463. The next prime is 999784481. The reversal of 999784469 is 964487999.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 818532100 + 181252369 = 28610^2 + 13463^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-999784469 is a prime.

It is a super-2 number, since 2×999784469² = 1999137968907223922, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (999784463) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499892234 + 499892235.

It is an arithmetic number, because the mean of its divisors is an integer number (499892235).

Almost surely, 2^999784469 is an apocalyptic number.

It is an amenable number.

999784469 is a deficient number, since it is larger than the sum of its proper divisors (1).

999784469 is an equidigital number, since it uses as much as digits as its factorization.

999784469 is an evil number, because the sum of its binary digits is even.

The product of its digits is 35271936, while the sum is 65.

The square root of 999784469 is about 31619.3685737081. The cubic root of 999784469 is about 999.9281511712.

The spelling of 999784469 in words is "nine hundred ninety-nine million, seven hundred eighty-four thousand, four hundred sixty-nine".