399999311 has 4 divisors (see below), whose sum is σ = 402919152. Its totient is φ = 397079472.

The previous prime is 399999247. The next prime is 399999317. The reversal of 399999311 is 113999993.

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 399999311 - 2⁶ = 399999247 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 (399999317) 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 3 ways as a sum of consecutive naturals, for example, 1459715 + ... + 1459988.

It is an arithmetic number, because the mean of its divisors is an integer number (100729788).

Almost surely, 2^399999311 is an apocalyptic number.

399999311 is a deficient number, since it is larger than the sum of its proper divisors (2919841).

399999311 is a wasteful number, since it uses less digits than its factorization.

399999311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2919840.

The product of its digits is 531441, while the sum is 53.

The square root of 399999311 is about 19999.9827749926. The cubic root of 399999311 is about 736.8058766782.

It can be divided in two parts, 3999993 and 11, that added together give a palindrome (4000004).

The spelling of 399999311 in words is "three hundred ninety-nine million, nine hundred ninety-nine thousand, three hundred eleven".