399600043 has 2 divisors, whose sum is σ = 399600044. Its totient is φ = 399600042.

The previous prime is 399600017. The next prime is 399600049. The reversal of 399600043 is 340006993.

It is a strong prime.

It is an emirp because it is prime and its reverse (340006993) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-399600043 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 399599981 and 399600008.

It is not a weakly prime, because it can be changed into another prime (399600049) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199800021 + 199800022.

It is an arithmetic number, because the mean of its divisors is an integer number (199800022).

Almost surely, 2^399600043 is an apocalyptic number.

399600043 is a deficient number, since it is larger than the sum of its proper divisors (1).

399600043 is an equidigital number, since it uses as much as digits as its factorization.

399600043 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17496, while the sum is 34.

The square root of 399600043 is about 19989.9985742871. The cubic root of 399600043 is about 736.5606421351.

The spelling of 399600043 in words is "three hundred ninety-nine million, six hundred thousand, forty-three".