6621938 has 8 divisors (see below), whose sum is σ = 10058880. Its totient is φ = 3268980.

The previous prime is 6621931. The next prime is 6621943. The reversal of 6621938 is 8391266.

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

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 6621898 and 6621907.

It is not an unprimeable number, because it can be changed into a prime (6621931) 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 3 ways as a sum of consecutive naturals, for example, 20798 + ... + 21113.

It is an arithmetic number, because the mean of its divisors is an integer number (1257360).

Almost surely, 2^6621938 is an apocalyptic number.

6621938 is a deficient number, since it is larger than the sum of its proper divisors (3436942).

6621938 is a wasteful number, since it uses less digits than its factorization.

6621938 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41992.

The product of its digits is 15552, while the sum is 35.

The square root of 6621938 is about 2573.3126510395. The cubic root of 6621938 is about 187.7853480395.

The spelling of 6621938 in words is "six million, six hundred twenty-one thousand, nine hundred thirty-eight".