1021828 has 6 divisors (see below), whose sum is σ = 1788206. Its totient is φ = 510912.

The previous prime is 1021807. The next prime is 1021831. The reversal of 1021828 is 8281201.

It can be written as a sum of positive squares in only one way, i.e., 743044 + 278784 = 862^2 + 528^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1021799 and 1021808.

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, 127725 + ... + 127732.

2^1021828 is an apocalyptic number.

It is an amenable number.

1021828 is a deficient number, since it is larger than the sum of its proper divisors (766378).

1021828 is a wasteful number, since it uses less digits than its factorization.

1021828 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 255461 (or 255459 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 22.

The square root of 1021828 is about 1010.8550835802. The cubic root of 1021828 is about 100.7223692617.

It can be divided in two parts, 1021 and 828, that added together give a square (1849 = 43²).

The spelling of 1021828 in words is "one million, twenty-one thousand, eight hundred twenty-eight".