399974400000 has 1224 divisors, whose sum is σ = 1703813948928. Its totient is φ = 88473600000.

The previous prime is 399974399987. The next prime is 399974400037. The reversal of 399974400000 is 4479993.

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 71 ways as a sum of consecutive naturals, for example, 12902399985 + ... + 12902400015.

Almost surely, 2^399974400000 is an apocalyptic number.

399974400000 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 399974400000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (851906974464).

399974400000 is an abundant number, since it is smaller than the sum of its proper divisors (1303839548928).

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

399974400000 is an frugal number, since it uses more digits than its factorization.

399974400000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101 (or 48 counting only the distinct ones).

The product of its (nonzero) digits is 244944, while the sum is 45.

Adding to 399974400000 its reverse (4479993), we get a palindrome (399978879993).

The spelling of 399974400000 in words is "three hundred ninety-nine billion, nine hundred seventy-four million, four hundred thousand".