399840211 has 8 divisors (see below), whose sum is σ = 417653280. Its totient is φ = 382062912.

The previous prime is 399840191. The next prime is 399840253. The reversal of 399840211 is 112048993.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 399840211 - 2⁵ = 399840179 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (399840271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15345 + ... + 32173.

It is an arithmetic number, because the mean of its divisors is an integer number (52206660).

Almost surely, 2^399840211 is an apocalyptic number.

399840211 is a deficient number, since it is larger than the sum of its proper divisors (17813069).

399840211 is a wasteful number, since it uses less digits than its factorization.

399840211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17885.

The product of its (nonzero) digits is 15552, while the sum is 37.

The square root of 399840211 is about 19996.0048759746. The cubic root of 399840211 is about 736.7081753761.

The spelling of 399840211 in words is "three hundred ninety-nine million, eight hundred forty thousand, two hundred eleven".