1287530 has 16 divisors (see below), whose sum is σ = 2332800. Its totient is φ = 511632.

The previous prime is 1287511. The next prime is 1287541. The reversal of 1287530 is 357821.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1287530.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1667 + ... + 2313.

It is an arithmetic number, because the mean of its divisors is an integer number (145800).

2^1287530 is an apocalyptic number.

1287530 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1287530 is a deficient number, since it is larger than the sum of its proper divisors (1045270).

1287530 is a wasteful number, since it uses less digits than its factorization.

1287530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 853.

The product of its (nonzero) digits is 1680, while the sum is 26.

The square root of 1287530 is about 1134.6937912935. The cubic root of 1287530 is about 108.7892006474.

The spelling of 1287530 in words is "one million, two hundred eighty-seven thousand, five hundred thirty".