399363993 has 16 divisors (see below), whose sum is σ = 676172160. Its totient is φ = 228207888.

The previous prime is 399363953. The next prime is 399363997.

399363993 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 399363993 - 2¹⁰ = 399362969 is a prime.

It is not an unprimeable number, because it can be changed into a prime (399363997) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1056330 + ... + 1056707.

It is an arithmetic number, because the mean of its divisors is an integer number (42260760).

Almost surely, 2^399363993 is an apocalyptic number.

It is an amenable number.

399363993 is a deficient number, since it is larger than the sum of its proper divisors (276808167).

399363993 is a wasteful number, since it uses less digits than its factorization.

399363993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2113053 (or 2113047 counting only the distinct ones).

The product of its digits is 3188646, while the sum is 54.

The square root of 399363993 is about 19984.0934995811. The cubic root of 399363993 is about 736.4155809347.

The spelling of 399363993 in words is "three hundred ninety-nine million, three hundred sixty-three thousand, nine hundred ninety-three".