399916811 has 8 divisors (see below), whose sum is σ = 458700000. Its totient is φ = 341546688.

The previous prime is 399916733. The next prime is 399916817. The reversal of 399916811 is 118619993.

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

It is not a de Polignac number, because 399916811 - 2¹⁸ = 399654667 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (399916817) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 101186 + ... + 105063.

It is an arithmetic number, because the mean of its divisors is an integer number (57337500).

Almost surely, 2^399916811 is an apocalyptic number.

399916811 is a deficient number, since it is larger than the sum of its proper divisors (58783189).

399916811 is a wasteful number, since it uses less digits than its factorization.

399916811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 206533.

The product of its digits is 104976, while the sum is 47.

The square root of 399916811 is about 19997.9201668574. The cubic root of 399916811 is about 736.7552177040.

The spelling of 399916811 in words is "three hundred ninety-nine million, nine hundred sixteen thousand, eight hundred eleven".