399823603 has 2 divisors, whose sum is σ = 399823604. Its totient is φ = 399823602.

The previous prime is 399823597. The next prime is 399823687. The reversal of 399823603 is 306328993.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (306328993) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 399823603 - 2⁹ = 399823091 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 399823603.

It is not a weakly prime, because it can be changed into another prime (399823003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199911801 + 199911802.

It is an arithmetic number, because the mean of its divisors is an integer number (199911802).

Almost surely, 2^399823603 is an apocalyptic number.

399823603 is a deficient number, since it is larger than the sum of its proper divisors (1).

399823603 is an equidigital number, since it uses as much as digits as its factorization.

399823603 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 209952, while the sum is 43.

The square root of 399823603 is about 19995.5895887068. The cubic root of 399823603 is about 736.6979751190.

The spelling of 399823603 in words is "three hundred ninety-nine million, eight hundred twenty-three thousand, six hundred three".