399349440000 has 2000 divisors, whose sum is σ = 1781904807936. Its totient is φ = 87091200000.

The previous prime is 399349439989. The next prime is 399349440041. The reversal of 399349440000 is 44943993.

399349440000 is a `hidden beast` number, since 39 + 93 + 494 + 40 + 0 + 0 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (2000).

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 pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 199 ways as a sum of consecutive naturals, for example, 5624639965 + ... + 5624640035.

Almost surely, 2^399349440000 is an apocalyptic number.

399349440000 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 399349440000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (890952403968).

399349440000 is an abundant number, since it is smaller than the sum of its proper divisors (1382555367936).

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

399349440000 is an frugal number, since it uses more digits than its factorization.

399349440000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 159 (or 119 counting only the distinct ones).

The product of its (nonzero) digits is 419904, while the sum is 45.

The spelling of 399349440000 in words is "three hundred ninety-nine billion, three hundred forty-nine million, four hundred forty thousand".