6621404 has 12 divisors (see below), whose sum is σ = 11671800. Its totient is φ = 3286608.

The previous prime is 6621379. The next prime is 6621413. The reversal of 6621404 is 4041266.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 6621404.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5399 + ... + 6510.

It is an arithmetic number, because the mean of its divisors is an integer number (972650).

Almost surely, 2^6621404 is an apocalyptic number.

It is an amenable number.

6621404 is a deficient number, since it is larger than the sum of its proper divisors (5050396).

6621404 is a wasteful number, since it uses less digits than its factorization.

6621404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12052 (or 12050 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 23.

The square root of 6621404 is about 2573.2088916371. The cubic root of 6621404 is about 187.7803001683.

The spelling of 6621404 in words is "six million, six hundred twenty-one thousand, four hundred four".