399880818 has 24 divisors (see below), whose sum is σ = 866784828. Its totient is φ = 133235712.

The previous prime is 399880807. The next prime is 399880823. The reversal of 399880818 is 818088993.

It can be written as a sum of positive squares in 2 ways, for example, as 395731449 + 4149369 = 19893^2 + 2037^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 65346 + ... + 71202.

Almost surely, 2^399880818 is an apocalyptic number.

399880818 is an abundant number, since it is smaller than the sum of its proper divisors (466904010).

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

399880818 is a wasteful number, since it uses less digits than its factorization.

399880818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9658 (or 9655 counting only the distinct ones).

The product of its (nonzero) digits is 995328, while the sum is 54.

The square root of 399880818 is about 19997.0202280240. The cubic root of 399880818 is about 736.7331140852.

The spelling of 399880818 in words is "three hundred ninety-nine million, eight hundred eighty thousand, eight hundred eighteen".