399663905371 has 4 divisors (see below), whose sum is σ = 409411805544. Its totient is φ = 389916005200.

The previous prime is 399663905369. The next prime is 399663905419. The reversal of 399663905371 is 173509366993.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 399663905371 - 2¹ = 399663905369 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (399663905071) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4873950025 + ... + 4873950106.

It is an arithmetic number, because the mean of its divisors is an integer number (102352951386).

Almost surely, 2^399663905371 is an apocalyptic number.

399663905371 is a deficient number, since it is larger than the sum of its proper divisors (9747900173).

399663905371 is an equidigital number, since it uses as much as digits as its factorization.

399663905371 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9747900172.

The product of its (nonzero) digits is 24800580, while the sum is 61.

The spelling of 399663905371 in words is "three hundred ninety-nine billion, six hundred sixty-three million, nine hundred five thousand, three hundred seventy-one".