6621387 has 4 divisors (see below), whose sum is σ = 8828520. Its totient is φ = 4414256.

The previous prime is 6621379. The next prime is 6621413. The reversal of 6621387 is 7831266.

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

It is a cyclic number.

It is not a de Polignac number, because 6621387 - 2³ = 6621379 is a prime.

It is a D-number.

It is not an unprimeable number, because it can be changed into a prime (6621337) 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, 1103562 + ... + 1103567.

It is an arithmetic number, because the mean of its divisors is an integer number (2207130).

Almost surely, 2^6621387 is an apocalyptic number.

6621387 is a deficient number, since it is larger than the sum of its proper divisors (2207133).

6621387 is a wasteful number, since it uses less digits than its factorization.

6621387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2207132.

The product of its digits is 12096, while the sum is 33.

The square root of 6621387 is about 2573.2055883664. The cubic root of 6621387 is about 187.7801394638.

The spelling of 6621387 in words is "six million, six hundred twenty-one thousand, three hundred eighty-seven".