1287373 has 2 divisors, whose sum is σ = 1287374. Its totient is φ = 1287372.

The previous prime is 1287371. The next prime is 1287401. The reversal of 1287373 is 3737821.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1261129 + 26244 = 1123^2 + 162^2 .

It is an emirp because it is prime and its reverse (3737821) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1287373 - 2¹ = 1287371 is a prime.

It is a super-2 number, since 2×1287373² = 3314658482258, which contains 22 as substring.

Together with 1287371, it forms a pair of twin primes.

It is an Ulam number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1287371) by changing a digit.

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, 643686 + 643687.

It is an arithmetic number, because the mean of its divisors is an integer number (643687).

2^1287373 is an apocalyptic number.

It is an amenable number.

1287373 is a deficient number, since it is larger than the sum of its proper divisors (1).

1287373 is an equidigital number, since it uses as much as digits as its factorization.

1287373 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7056, while the sum is 31.

The square root of 1287373 is about 1134.6246075244. The cubic root of 1287373 is about 108.7847785889.

The spelling of 1287373 in words is "one million, two hundred eighty-seven thousand, three hundred seventy-three".