6621843 has 4 divisors (see below), whose sum is σ = 8829128. Its totient is φ = 4414560.

The previous prime is 6621841. The next prime is 6621847. The reversal of 6621843 is 3481266.

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

It is not a de Polignac number, because 6621843 - 2¹ = 6621841 is a prime.

It is a D-number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 6621843.

It is not an unprimeable number, because it can be changed into a prime (6621841) 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, 1103638 + ... + 1103643.

It is an arithmetic number, because the mean of its divisors is an integer number (2207282).

Almost surely, 2^6621843 is an apocalyptic number.

6621843 is a deficient number, since it is larger than the sum of its proper divisors (2207285).

6621843 is a wasteful number, since it uses less digits than its factorization.

6621843 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2207284.

The product of its digits is 6912, while the sum is 30.

The square root of 6621843 is about 2573.2941922757. The cubic root of 6621843 is about 187.7844500299.

The spelling of 6621843 in words is "six million, six hundred twenty-one thousand, eight hundred forty-three".