1287808 has 16 divisors (see below), whose sum is σ = 2565810. Its totient is φ = 643840.

The previous prime is 1287799. The next prime is 1287817. The reversal of 1287808 is 8087821.

1287808 is nontrivially palindromic in base 5.

It is an interprime number because it is at equal distance from previous prime (1287799) and next prime (1287817).

It can be written as a sum of positive squares in only one way, i.e., 1065024 + 222784 = 1032^2 + 472^2 .

It is a tau number, because it is divible by the number of its divisors (16).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4903 + ... + 5158.

2^1287808 is an apocalyptic number.

It is an amenable number.

1287808 is a deficient number, since it is larger than the sum of its proper divisors (1278002).

1287808 is an equidigital number, since it uses as much as digits as its factorization.

1287808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10075 (or 10063 counting only the distinct ones).

The product of its (nonzero) digits is 7168, while the sum is 34.

The square root of 1287808 is about 1134.8162846911. The cubic root of 1287808 is about 108.7970299074.

The spelling of 1287808 in words is "one million, two hundred eighty-seven thousand, eight hundred eight".