399350920 has 16 divisors (see below), whose sum is σ = 898539660. Its totient is φ = 159740352.

The previous prime is 399350899. The next prime is 399350923. The reversal of 399350920 is 29053993.

It can be written as a sum of positive squares in 2 ways, for example, as 393387556 + 5963364 = 19834^2 + 2442^2 .

It is a Harshad number since it is a multiple of its sum of digits (40), and also a Moran number because the ratio is a prime number: 9983773 = 399350920 / (3 + 9 + 9 + 3 + 5 + 0 + 9 + 2 + 0).

It is not an unprimeable number, because it can be changed into a prime (399350923) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4991847 + ... + 4991926.

Almost surely, 2^399350920 is an apocalyptic number.

It is an amenable number.

399350920 is an abundant number, since it is smaller than the sum of its proper divisors (499188740).

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

399350920 is a wasteful number, since it uses less digits than its factorization.

399350920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9983784 (or 9983780 counting only the distinct ones).

The product of its (nonzero) digits is 65610, while the sum is 40.

The square root of 399350920 is about 19983.7664117653. The cubic root of 399350920 is about 736.4075454365.

The spelling of 399350920 in words is "three hundred ninety-nine million, three hundred fifty thousand, nine hundred twenty".