399385993099 has 4 divisors (see below), whose sum is σ = 402301219464. Its totient is φ = 396470766736.

The previous prime is 399385993043. The next prime is 399385993157. The reversal of 399385993099 is 990399583993.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 990399583993 = 59 ⋅16786433627.

It is a cyclic number.

It is not a de Polignac number, because 399385993099 - 2⁹ = 399385992587 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (399385913099) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1457612977 + ... + 1457613250.

It is an arithmetic number, because the mean of its divisors is an integer number (100575304866).

Almost surely, 2^399385993099 is an apocalyptic number.

399385993099 is a deficient number, since it is larger than the sum of its proper divisors (2915226365).

399385993099 is a wasteful number, since it uses less digits than its factorization.

399385993099 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2915226364.

The product of its (nonzero) digits is 573956280, while the sum is 76.

The spelling of 399385993099 in words is "three hundred ninety-nine billion, three hundred eighty-five million, nine hundred ninety-three thousand, ninety-nine".