399974400 has 504 divisors, whose sum is σ = 1690201344. Its totient is φ = 88473600.

The previous prime is 399974383. The next prime is 399974401. The reversal of 399974400 is 4479993.

It is a tau number, because it is divible by the number of its divisors (504).

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399974401) by changing a digit.

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 35 ways as a sum of consecutive naturals, for example, 12902385 + ... + 12902415.

Almost surely, 2^399974400 is an apocalyptic number.

399974400 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 399974400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (845100672).

399974400 is an abundant number, since it is smaller than the sum of its proper divisors (1290226944).

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

399974400 is a wasteful number, since it uses less digits than its factorization.

399974400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80 (or 48 counting only the distinct ones).

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

The square root of 399974400 is about 19999.3599897597. The cubic root of 399974400 is about 736.7905808583.

The spelling of 399974400 in words is "three hundred ninety-nine million, nine hundred seventy-four thousand, four hundred".