1282821 has 8 divisors (see below), whose sum is σ = 1726560. Its totient is φ = 847152.

The previous prime is 1282817. The next prime is 1282867.

1282821 is nontrivially palindromic in base 10.

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

It is not a de Polignac number, because 1282821 - 2² = 1282817 is a prime.

It is a super-3 number, since 3×1282821³ = 6333145081581220983, which contains 333 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1282791 and 1282800.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1282121) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1635 + ... + 2288.

It is an arithmetic number, because the mean of its divisors is an integer number (215820).

2^1282821 is an apocalyptic number.

It is an amenable number.

1282821 is a deficient number, since it is larger than the sum of its proper divisors (443739).

1282821 is a wasteful number, since it uses less digits than its factorization.

1282821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4035.

The product of its digits is 512, while the sum is 24.

The square root of 1282821 is about 1132.6168813858. The cubic root of 1282821 is about 108.6564104304.

The spelling of 1282821 in words is "one million, two hundred eighty-two thousand, eight hundred twenty-one".