999784449 has 12 divisors (see below), whose sum is σ = 1467808212. Its totient is φ = 655596000.

The previous prime is 999784393. The next prime is 999784463. The reversal of 999784449 is 944487999.

It can be written as a sum of positive squares in 2 ways, for example, as 264290049 + 735494400 = 16257^2 + 27120^2 .

It is not a de Polignac number, because 999784449 - 2⁹ = 999783937 is a prime.

It is not an unprimeable number, because it can be changed into a prime (999784469) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 910002 + ... + 911099.

It is an arithmetic number, because the mean of its divisors is an integer number (122317351).

It is a Proth number, since it is equal to 30511 ⋅ 2¹⁵ + 1 and 30511 < 2¹⁵.

Almost surely, 2^999784449 is an apocalyptic number.

It is an amenable number.

999784449 is a deficient number, since it is larger than the sum of its proper divisors (468023763).

999784449 is a wasteful number, since it uses less digits than its factorization.

999784449 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1821168 (or 1821165 counting only the distinct ones).

The product of its digits is 23514624, while the sum is 63.

The square root of 999784449 is about 31619.3682574463. The cubic root of 999784449 is about 999.9281445036.

The spelling of 999784449 in words is "nine hundred ninety-nine million, seven hundred eighty-four thousand, four hundred forty-nine".