10399666 has 8 divisors (see below), whose sum is σ = 15622380. Its totient is φ = 5192208.

The previous prime is 10399637. The next prime is 10399687. The reversal of 10399666 is 66699301.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 9641025 + 758641 = 3105^2 + 871^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

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, 1921 + ... + 4948.

Almost surely, 2^10399666 is an apocalyptic number.

10399666 is a deficient number, since it is larger than the sum of its proper divisors (5222714).

10399666 is an equidigital number, since it uses as much as digits as its factorization.

10399666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7628.

The product of its (nonzero) digits is 52488, while the sum is 40.

The square root of 10399666 is about 3224.8513144020. The cubic root of 10399666 is about 218.2762398871.

The spelling of 10399666 in words is "ten million, three hundred ninety-nine thousand, six hundred sixty-six".