399305503993 has 16 divisors (see below), whose sum is σ = 442479283200. Its totient is φ = 357294355600.

The previous prime is 399305503967. The next prime is 399305503999.

399305503993 is nontrivially palindromic in base 10.

It is a cyclic number.

It is not a de Polignac number, because 399305503993 - 2¹³ = 399305495801 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (399305503999) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 41046 + ... + 894592.

It is an arithmetic number, because the mean of its divisors is an integer number (27654955200).

Almost surely, 2^399305503993 is an apocalyptic number.

It is an amenable number.

399305503993 is a deficient number, since it is larger than the sum of its proper divisors (43173779207).

399305503993 is a wasteful number, since it uses less digits than its factorization.

399305503993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 854228.

The product of its (nonzero) digits is 13286025, while the sum is 58.

The spelling of 399305503993 in words is "three hundred ninety-nine billion, three hundred five million, five hundred three thousand, nine hundred ninety-three".