399282284520 has 320 divisors, whose sum is σ = 1614476476800. Its totient is φ = 86461032960.

The previous prime is 399282284509. The next prime is 399282284537. The reversal of 399282284520 is 25482282993.

It is a happy number.

399282284520 is a `hidden beast` number, since 3 + 9 + 92 + 8 + 2 + 28 + 4 + 520 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 32371 + ... + 894210.

It is an arithmetic number, because the mean of its divisors is an integer number (5045238990).

Almost surely, 2^399282284520 is an apocalyptic number.

399282284520 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 399282284520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (807238238400).

399282284520 is an abundant number, since it is smaller than the sum of its proper divisors (1215194192280).

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

399282284520 is a wasteful number, since it uses less digits than its factorization.

399282284520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 926630 (or 926617 counting only the distinct ones).

The product of its (nonzero) digits is 4976640, while the sum is 54.

The spelling of 399282284520 in words is "three hundred ninety-nine billion, two hundred eighty-two million, two hundred eighty-four thousand, five hundred twenty".