1287099 has 12 divisors (see below), whose sum is σ = 2028312. Its totient is φ = 780000.

The previous prime is 1287071. The next prime is 1287101. The reversal of 1287099 is 9907821.

It is a happy number.

It is not a de Polignac number, because 1287099 - 2⁵ = 1287067 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1287059) 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, 6402 + ... + 6599.

It is an arithmetic number, because the mean of its divisors is an integer number (169026).

2^1287099 is an apocalyptic number.

1287099 is a deficient number, since it is larger than the sum of its proper divisors (741213).

1287099 is a wasteful number, since it uses less digits than its factorization.

1287099 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13018 (or 13015 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 36.

The square root of 1287099 is about 1134.5038563178. The cubic root of 1287099 is about 108.7770602498. Note that the first 3 decimals are identical.

It can be divided in two parts, 128 and 7099, that added together give a palindrome (7227).

The spelling of 1287099 in words is "one million, two hundred eighty-seven thousand, ninety-nine".