1287238 has 4 divisors (see below), whose sum is σ = 1930860. Its totient is φ = 643618.

The previous prime is 1287233. The next prime is 1287239. The reversal of 1287238 is 8327821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8327821 = 1871 ⋅4451.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1287233) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321808 + ... + 321811.

It is an arithmetic number, because the mean of its divisors is an integer number (482715).

2^1287238 is an apocalyptic number.

1287238 is a deficient number, since it is larger than the sum of its proper divisors (643622).

1287238 is an equidigital number, since it uses as much as digits as its factorization.

1287238 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 643621.

The product of its digits is 5376, while the sum is 31.

The square root of 1287238 is about 1134.5651149229. The cubic root of 1287238 is about 108.7809758945.

The spelling of 1287238 in words is "one million, two hundred eighty-seven thousand, two hundred thirty-eight".