621743 has 4 divisors (see below), whose sum is σ = 633528. Its totient is φ = 609960.

The previous prime is 621739. The next prime is 621749. The reversal of 621743 is 347126.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 621743 - 2² = 621739 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (621749) 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 3 ways as a sum of consecutive naturals, for example, 5813 + ... + 5918.

It is an arithmetic number, because the mean of its divisors is an integer number (158382).

2⁶²¹⁷⁴³ is an apocalyptic number.

621743 is a deficient number, since it is larger than the sum of its proper divisors (11785).

621743 is a wasteful number, since it uses less digits than its factorization.

621743 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11784.

The product of its digits is 1008, while the sum is 23.

The square root of 621743 is about 788.5068167112. The cubic root of 621743 is about 85.3500214893.

Adding to 621743 its reverse (347126), we get a palindrome (968869).

The spelling of 621743 in words is "six hundred twenty-one thousand, seven hundred forty-three".