6629999 has 4 divisors (see below), whose sum is σ = 6644664. Its totient is φ = 6615336.

The previous prime is 6629969. The next prime is 6630011. The reversal of 6629999 is 9999266.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9999266 = 2 ⋅4999633.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6629999 is a prime.

It is a Duffinian number.

6629999 is a modest number, since divided by 9999 gives 662 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6629969) 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 3 ways as a sum of consecutive naturals, for example, 6632 + ... + 7565.

It is an arithmetic number, because the mean of its divisors is an integer number (1661166).

Almost surely, 2^6629999 is an apocalyptic number.

6629999 is a deficient number, since it is larger than the sum of its proper divisors (14665).

6629999 is a wasteful number, since it uses less digits than its factorization.

6629999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14664.

The product of its digits is 472392, while the sum is 50.

The square root of 6629999 is about 2574.8784437328. The cubic root of 6629999 is about 187.8615152619.

The spelling of 6629999 in words is "six million, six hundred twenty-nine thousand, nine hundred ninety-nine".