1287538 has 8 divisors (see below), whose sum is σ = 2207232. Its totient is φ = 551796.

The previous prime is 1287511. The next prime is 1287541. The reversal of 1287538 is 8357821.

It is a sphenic number, since it is the product of 3 distinct primes.

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 3 ways as a sum of consecutive naturals, for example, 45970 + ... + 45997.

It is an arithmetic number, because the mean of its divisors is an integer number (275904).

2^1287538 is an apocalyptic number.

1287538 is a deficient number, since it is larger than the sum of its proper divisors (919694).

1287538 is an equidigital number, since it uses as much as digits as its factorization.

1287538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91976.

The product of its digits is 13440, while the sum is 34.

The square root of 1287538 is about 1134.6973164681. The cubic root of 1287538 is about 108.7894259656.

The spelling of 1287538 in words is "one million, two hundred eighty-seven thousand, five hundred thirty-eight".