399867328 has 112 divisors (see below), whose sum is σ = 956242944. Its totient is φ = 162201600.

The previous prime is 399867257. The next prime is 399867329. The reversal of 399867328 is 823768993.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (112).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399867329) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 1555776 + ... + 1556032.

Almost surely, 2^399867328 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 399867328, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (478121472).

399867328 is an abundant number, since it is smaller than the sum of its proper divisors (556375616).

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

399867328 is a wasteful number, since it uses less digits than its factorization.

399867328 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 450 (or 440 counting only the distinct ones).

The product of its digits is 3919104, while the sum is 55.

The square root of 399867328 is about 19996.6829249253. The cubic root of 399867328 is about 736.7248294156.

The spelling of 399867328 in words is "three hundred ninety-nine million, eight hundred sixty-seven thousand, three hundred twenty-eight".