1022643 has 18 divisors (see below), whose sum is σ = 1536444. Its totient is φ = 655344.

The previous prime is 1022639. The next prime is 1022653. The reversal of 1022643 is 3462201.

It is a happy number.

1022643 is a `hidden beast` number, since 1 + 0 + 22 + 643 = 666.

It is not a de Polignac number, because 1022643 - 2² = 1022639 is a prime.

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (1022633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 12280 + ... + 12362.

It is an arithmetic number, because the mean of its divisors is an integer number (85358).

2^1022643 is an apocalyptic number.

1022643 is a deficient number, since it is larger than the sum of its proper divisors (513801).

1022643 is an equidigital number, since it uses as much as digits as its factorization.

1022643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163 (or 123 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 1022643 is about 1011.2581272850. The cubic root of 1022643 is about 100.7491405370.

Adding to 1022643 its reverse (3462201), we get a palindrome (4484844).

The spelling of 1022643 in words is "one million, twenty-two thousand, six hundred forty-three".