399443968 has 192 divisors, whose sum is σ = 1061424000. Its totient is φ = 145489920.

The previous prime is 399443923. The next prime is 399443969. The reversal of 399443968 is 869344993.

It is not an unprimeable number, because it can be changed into a prime (399443969) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2680758 + ... + 2680906.

It is an arithmetic number, because the mean of its divisors is an integer number (5528250).

Almost surely, 2^399443968 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 399443968, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (530712000).

399443968 is an abundant number, since it is smaller than the sum of its proper divisors (661980032).

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

399443968 is a wasteful number, since it uses less digits than its factorization.

399443968 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 206 (or 186 counting only the distinct ones).

The product of its digits is 5038848, while the sum is 55.

The square root of 399443968 is about 19986.0943658335. The cubic root of 399443968 is about 736.4647348446.

The spelling of 399443968 in words is "three hundred ninety-nine million, four hundred forty-three thousand, nine hundred sixty-eight".