1287000649 has 12 divisors (see below), whose sum is σ = 1415569540. Its totient is φ = 1169229600.

The previous prime is 1287000647. The next prime is 1287000703. The reversal of 1287000649 is 9460007821.

It can be written as a sum of positive squares in 2 ways, for example, as 430853049 + 856147600 = 20757^2 + 29260^2 .

It is not a de Polignac number, because 1287000649 - 2¹ = 1287000647 is a prime.

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (1287000647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 266347 + ... + 271135.

Almost surely, 2^1287000649 is an apocalyptic number.

It is an amenable number.

1287000649 is a deficient number, since it is larger than the sum of its proper divisors (128568891).

1287000649 is a wasteful number, since it uses less digits than its factorization.

1287000649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7032 (or 7021 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 37.

The square root of 1287000649 is about 35874.7912746541. The cubic root of 1287000649 is about 1087.7428952142.

The spelling of 1287000649 in words is "one billion, two hundred eighty-seven million, six hundred forty-nine", and thus it is an aban number.