399216810 has 16 divisors (see below), whose sum is σ = 958120416. Its totient is φ = 106457808.

The previous prime is 399216799. The next prime is 399216817. The reversal of 399216810 is 18612993.

It is a super-2 number, since 2×399216810² = 318748122773152200, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (399216817) 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, 6653584 + ... + 6653643.

It is an arithmetic number, because the mean of its divisors is an integer number (59882526).

Almost surely, 2^399216810 is an apocalyptic number.

399216810 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

399216810 is an abundant number, since it is smaller than the sum of its proper divisors (558903606).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

399216810 is a wasteful number, since it uses less digits than its factorization.

399216810 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13307237.

The product of its (nonzero) digits is 23328, while the sum is 39.

The square root of 399216810 is about 19980.4106564405. The cubic root of 399216810 is about 736.3251027625.

It can be divided in two parts, 3992 and 16810, that added together give a palindrome (20802).

The spelling of 399216810 in words is "three hundred ninety-nine million, two hundred sixteen thousand, eight hundred ten".