6623945 has 16 divisors (see below), whose sum is σ = 8252928. Its totient is φ = 5100480.

The previous prime is 6623927. The next prime is 6623959. The reversal of 6623945 is 5493266.

It is not a de Polignac number, because 6623945 - 2¹² = 6619849 is a prime.

It is a d-powerful number, because it can be written as 6⁶ + 6⁸ + 2⁹ + 3⁹ + 9⁷ + 4⁷ + 5⁷ .

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16487 + ... + 16883.

It is an arithmetic number, because the mean of its divisors is an integer number (515808).

Almost surely, 2^6623945 is an apocalyptic number.

It is an amenable number.

6623945 is a deficient number, since it is larger than the sum of its proper divisors (1628983).

6623945 is a wasteful number, since it uses less digits than its factorization.

6623945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 520.

The product of its digits is 38880, while the sum is 35.

The square root of 6623945 is about 2573.7025857702. The cubic root of 6623945 is about 187.8043176687.

The spelling of 6623945 in words is "six million, six hundred twenty-three thousand, nine hundred forty-five".