399738811 has 4 divisors (see below), whose sum is σ = 399782800. Its totient is φ = 399694824.

The previous prime is 399738809. The next prime is 399738869. The reversal of 399738811 is 118837993.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 399738811 - 2¹ = 399738809 is a prime.

It is a super-3 number, since 3×399738811³ (a number of 27 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (399738011) 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, 2751 + ... + 28408.

It is an arithmetic number, because the mean of its divisors is an integer number (99945700).

Almost surely, 2^399738811 is an apocalyptic number.

399738811 is a deficient number, since it is larger than the sum of its proper divisors (43989).

399738811 is a wasteful number, since it uses less digits than its factorization.

399738811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43988.

The product of its digits is 326592, while the sum is 49.

The square root of 399738811 is about 19993.4692087191. The cubic root of 399738811 is about 736.6458933922.

It can be divided in two parts, 39973 and 8811, that added together give a palindrome (48784).

The spelling of 399738811 in words is "three hundred ninety-nine million, seven hundred thirty-eight thousand, eight hundred eleven".