10399943 has 4 divisors (see below), whose sum is σ = 10406448. Its totient is φ = 10393440.

The previous prime is 10399931. The next prime is 10399957. The reversal of 10399943 is 34999301.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 34999301 = 1367 ⋅25603.

It is a cyclic number.

It is not a de Polignac number, because 10399943 - 2⁴ = 10399927 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 10399897 and 10399906.

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 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, 998 + ... + 4668.

It is an arithmetic number, because the mean of its divisors is an integer number (2601612).

Almost surely, 2^10399943 is an apocalyptic number.

10399943 is a deficient number, since it is larger than the sum of its proper divisors (6505).

10399943 is an equidigital number, since it uses as much as digits as its factorization.

10399943 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6504.

The product of its (nonzero) digits is 26244, while the sum is 38.

The square root of 10399943 is about 3224.8942618325. The cubic root of 10399943 is about 218.2781778333.

The spelling of 10399943 in words is "ten million, three hundred ninety-nine thousand, nine hundred forty-three".