399499776000 has 1872 divisors, whose sum is σ = 1702330943040. Its totient is φ = 93162700800.

The previous prime is 399499775999. The next prime is 399499776073. The reversal of 399499776000 is 677994993.

It is a tau number, because it is divible by the number of its divisors (1872).

It is a congruent number.

It is an unprimeable number.

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 143 ways as a sum of consecutive naturals, for example, 21026303991 + ... + 21026304009.

It is an arithmetic number, because the mean of its divisors is an integer number (909364820).

Almost surely, 2^399499776000 is an apocalyptic number.

399499776000 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 399499776000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (851165471520).

399499776000 is an abundant number, since it is smaller than the sum of its proper divisors (1302831167040).

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

399499776000 is an equidigital number, since it uses as much as digits as its factorization.

399499776000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99 (or 42 counting only the distinct ones).

The product of its (nonzero) digits is 23147208, while the sum is 63.

The spelling of 399499776000 in words is "three hundred ninety-nine billion, four hundred ninety-nine million, seven hundred seventy-six thousand".