399329280000 has 900 divisors, whose sum is σ = 1650109420960. Its totient is φ = 91127808000.

The previous prime is 399329279983. The next prime is 399329280019. The reversal of 399329280000 is 82923993.

It is a tau number, because it is divible by the number of its divisors (900).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 645119691 + ... + 645120309.

Almost surely, 2^399329280000 is an apocalyptic number.

399329280000 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 399329280000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (825054710480).

399329280000 is an abundant number, since it is smaller than the sum of its proper divisors (1250780140960).

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

399329280000 is an frugal number, since it uses more digits than its factorization.

399329280000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 680 (or 636 counting only the distinct ones).

The product of its (nonzero) digits is 209952, while the sum is 45.

The spelling of 399329280000 in words is "three hundred ninety-nine billion, three hundred twenty-nine million, two hundred eighty thousand".