621844 has 6 divisors (see below), whose sum is σ = 1088234. Its totient is φ = 310920.

The previous prime is 621833. The next prime is 621869. The reversal of 621844 is 448126.

621844 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 620944 + 900 = 788^2 + 30^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77727 + ... + 77734.

2⁶²¹⁸⁴⁴ is an apocalyptic number.

It is an amenable number.

621844 is a deficient number, since it is larger than the sum of its proper divisors (466390).

621844 is a wasteful number, since it uses less digits than its factorization.

621844 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155465 (or 155463 counting only the distinct ones).

The product of its digits is 1536, while the sum is 25.

The square root of 621844 is about 788.5708592130. The cubic root of 621844 is about 85.3546428444.

The spelling of 621844 in words is "six hundred twenty-one thousand, eight hundred forty-four".