1287386 has 4 divisors (see below), whose sum is σ = 1931082. Its totient is φ = 643692.

The previous prime is 1287373. The next prime is 1287401. The reversal of 1287386 is 6837821.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 776161 + 511225 = 881^2 + 715^2 .

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 as a sum of consecutive naturals, namely, 321845 + ... + 321848.

2^1287386 is an apocalyptic number.

1287386 is a deficient number, since it is larger than the sum of its proper divisors (643696).

1287386 is an equidigital number, since it uses as much as digits as its factorization.

1287386 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 643695.

The product of its digits is 16128, while the sum is 35.

The square root of 1287386 is about 1134.6303362770. The cubic root of 1287386 is about 108.7851447603.

The spelling of 1287386 in words is "one million, two hundred eighty-seven thousand, three hundred eighty-six".