621841 has 4 divisors (see below), whose sum is σ = 678384. Its totient is φ = 565300.

The previous prime is 621833. The next prime is 621869. The reversal of 621841 is 148126.

621841 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 621841 - 2³ = 621833 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (621821) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28255 + ... + 28276.

It is an arithmetic number, because the mean of its divisors is an integer number (169596).

2⁶²¹⁸⁴¹ is an apocalyptic number.

It is an amenable number.

621841 is a deficient number, since it is larger than the sum of its proper divisors (56543).

621841 is a wasteful number, since it uses less digits than its factorization.

621841 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56542.

The product of its digits is 384, while the sum is 22.

The square root of 621841 is about 788.5689570355. The cubic root of 621841 is about 85.3545055836.

Adding to 621841 its reverse (148126), we get a palindrome (769967).

The spelling of 621841 in words is "six hundred twenty-one thousand, eight hundred forty-one".