10399999 has 4 divisors (see below), whose sum is σ = 10425240. Its totient is φ = 10374760.

The previous prime is 10399993. The next prime is 10400021. The reversal of 10399999 is 99999301.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 99999301 = 103 ⋅970867.

It is a cyclic number.

It is not a de Polignac number, because 10399999 - 2¹³ = 10391807 is a prime.

It is a Duffinian number.

10399999 is a modest number, since divided by 9999 gives 1039 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10399993) 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, 11992 + ... + 12829.

It is an arithmetic number, because the mean of its divisors is an integer number (2606310).

Almost surely, 2^10399999 is an apocalyptic number.

10399999 is a deficient number, since it is larger than the sum of its proper divisors (25241).

10399999 is an equidigital number, since it uses as much as digits as its factorization.

10399999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25240.

The product of its (nonzero) digits is 177147, while the sum is 49.

The square root of 10399999 is about 3224.9029442760. The cubic root of 10399999 is about 218.2785696161.

The spelling of 10399999 in words is "ten million, three hundred ninety-nine thousand, nine hundred ninety-nine".