6620381 has 8 divisors (see below), whose sum is σ = 6894720. Its totient is φ = 6349168.

The previous prime is 6620371. The next prime is 6620387. The reversal of 6620381 is 1830266.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 6620381 - 2¹⁰ = 6619357 is a prime.

It is a super-2 number, since 2×6620381² = 87658889170322, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 6620381.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6620387) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4160 + ... + 5526.

It is an arithmetic number, because the mean of its divisors is an integer number (861840).

Almost surely, 2^6620381 is an apocalyptic number.

It is an amenable number.

6620381 is a deficient number, since it is larger than the sum of its proper divisors (274339).

6620381 is a wasteful number, since it uses less digits than its factorization.

6620381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1563.

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 6620381 is about 2573.0101049160. The cubic root of 6620381 is about 187.7706290501.

The spelling of 6620381 in words is "six million, six hundred twenty thousand, three hundred eighty-one".