399822826 has 32 divisors (see below), whose sum is σ = 670194000. Its totient is φ = 177623040.

The previous prime is 399822821. The next prime is 399822827. The reversal of 399822826 is 628228993.

It can be written as a sum of positive squares in 8 ways, for example, as 247275625 + 152547201 = 15725^2 + 12351^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 399822826.

It is not an unprimeable number, because it can be changed into a prime (399822821) 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 15 ways as a sum of consecutive naturals, for example, 337956 + ... + 339136.

Almost surely, 2^399822826 is an apocalyptic number.

399822826 is a deficient number, since it is larger than the sum of its proper divisors (270371174).

399822826 is a wasteful number, since it uses less digits than its factorization.

399822826 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1674.

The product of its digits is 746496, while the sum is 49.

The square root of 399822826 is about 19995.5701594128. The cubic root of 399822826 is about 736.6974978963.

The spelling of 399822826 in words is "three hundred ninety-nine million, eight hundred twenty-two thousand, eight hundred twenty-six".