399020811 has 8 divisors (see below), whose sum is σ = 608031744. Its totient is φ = 228011880.

The previous prime is 399020807. The next prime is 399020819. The reversal of 399020811 is 118020993.

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

It is not a de Polignac number, because 399020811 - 2² = 399020807 is a prime.

It is a super-2 number, since 2×399020811² = 318435215222195442, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (399020819) 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, 9500475 + ... + 9500516.

It is an arithmetic number, because the mean of its divisors is an integer number (76003968).

Almost surely, 2^399020811 is an apocalyptic number.

399020811 is a deficient number, since it is larger than the sum of its proper divisors (209010933).

399020811 is a wasteful number, since it uses less digits than its factorization.

399020811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19001001.

The product of its (nonzero) digits is 3888, while the sum is 33.

The square root of 399020811 is about 19975.5052752114. The cubic root of 399020811 is about 736.2045812774.

The spelling of 399020811 in words is "three hundred ninety-nine million, twenty thousand, eight hundred eleven".