1228287 has 4 divisors (see below), whose sum is σ = 1637720. Its totient is φ = 818856.

The previous prime is 1228277. The next prime is 1228291. The reversal of 1228287 is 7828221.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7828221 = 3 ⋅2609407.

It is not a de Polignac number, because 1228287 - 2⁷ = 1228159 is a prime.

It is a D-number.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1228247) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 204712 + ... + 204717.

It is an arithmetic number, because the mean of its divisors is an integer number (409430).

2^1228287 is an apocalyptic number.

1228287 is a deficient number, since it is larger than the sum of its proper divisors (409433).

1228287 is an equidigital number, since it uses as much as digits as its factorization.

1228287 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 409432.

The product of its digits is 3584, while the sum is 30.

The square root of 1228287 is about 1108.2811015261. The cubic root of 1228287 is about 107.0943645954.

The spelling of 1228287 in words is "one million, two hundred twenty-eight thousand, two hundred eighty-seven".