1643422 has 12 divisors (see below), whose sum is σ = 2710008. Its totient is φ = 746900.

The previous prime is 1643387. The next prime is 1643423. The reversal of 1643422 is 2243461.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a junction number, because it is equal to n+sod(n) for n = 1643393 and 1643402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1643423) by changing a digit.

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 in 5 ways as a sum of consecutive naturals, for example, 3154 + ... + 3637.

It is an arithmetic number, because the mean of its divisors is an integer number (225834).

2^1643422 is an apocalyptic number.

1643422 is a deficient number, since it is larger than the sum of its proper divisors (1066586).

1643422 is a wasteful number, since it uses less digits than its factorization.

1643422 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6815 (or 6804 counting only the distinct ones).

The product of its digits is 1152, while the sum is 22.

The square root of 1643422 is about 1281.9602177915. The cubic root of 1643422 is about 118.0093356590.

Adding to 1643422 its reverse (2243461), we get a palindrome (3886883).

The spelling of 1643422 in words is "one million, six hundred forty-three thousand, four hundred twenty-two".