6699945 has 16 divisors (see below), whose sum is σ = 12251520. Its totient is φ = 3062784.

The previous prime is 6699941. The next prime is 6699947. The reversal of 6699945 is 5499966.

It is a happy number.

It is not a de Polignac number, because 6699945 - 2² = 6699941 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 6699894 and 6699903.

It is not an unprimeable number, because it can be changed into a prime (6699941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31800 + ... + 32009.

It is an arithmetic number, because the mean of its divisors is an integer number (765720).

Almost surely, 2^6699945 is an apocalyptic number.

It is an amenable number.

6699945 is a deficient number, since it is larger than the sum of its proper divisors (5551575).

6699945 is a wasteful number, since it uses less digits than its factorization.

6699945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63824.

The product of its digits is 524880, while the sum is 48.

The square root of 6699945 is about 2588.4251969103. The cubic root of 6699945 is about 188.5198472489.

The spelling of 6699945 in words is "six million, six hundred ninety-nine thousand, nine hundred forty-five".