622643 has 12 divisors (see below), whose sum is σ = 737352. Its totient is φ = 524160.

The previous prime is 622639. The next prime is 622663. The reversal of 622643 is 346226.

It is not a de Polignac number, because 622643 - 2² = 622639 is a prime.

It is a d-powerful number, because it can be written as 6 + 2¹⁵ + 6² + 2¹⁹ + 4⁸ + 3² .

It is not an unprimeable number, because it can be changed into a prime (622603) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4688 + ... + 4818.

It is an arithmetic number, because the mean of its divisors is an integer number (61446).

2⁶²²⁶⁴³ is an apocalyptic number.

622643 is a deficient number, since it is larger than the sum of its proper divisors (114709).

622643 is a wasteful number, since it uses less digits than its factorization.

622643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 242 (or 235 counting only the distinct ones).

The product of its digits is 1728, while the sum is 23.

The square root of 622643 is about 789.0773092670. The cubic root of 622643 is about 85.3911842553.

Adding to 622643 its reverse (346226), we get a palindrome (968869).

The spelling of 622643 in words is "six hundred twenty-two thousand, six hundred forty-three".