399494475797 has 4 divisors (see below), whose sum is σ = 400361058636. Its totient is φ = 398627892960.

The previous prime is 399494475773. The next prime is 399494475827. The reversal of 399494475797 is 797574494993.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 797574494993 = 401237 ⋅1987789.

It can be written as a sum of positive squares in 2 ways, for example, as 52704221476 + 346790254321 = 229574^2 + 588889^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-399494475797 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399494475767) 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 3 ways as a sum of consecutive naturals, for example, 433290728 + ... + 433291649.

It is an arithmetic number, because the mean of its divisors is an integer number (100090264659).

Almost surely, 2^399494475797 is an apocalyptic number.

It is an amenable number.

399494475797 is a deficient number, since it is larger than the sum of its proper divisors (866582839).

399494475797 is an equidigital number, since it uses as much as digits as its factorization.

399494475797 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 866582838.

The product of its digits is 2160406080, while the sum is 77.

The spelling of 399494475797 in words is "three hundred ninety-nine billion, four hundred ninety-four million, four hundred seventy-five thousand, seven hundred ninety-seven".