381218400 has 432 divisors, whose sum is σ = 1458750384. Its totient is φ = 97044480.

The previous prime is 381218393. The next prime is 381218401. The reversal of 381218400 is 4812183.

It is a tau number, because it is divible by the number of its divisors (432).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (381218401) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 7192774 + ... + 7192826.

It is an arithmetic number, because the mean of its divisors is an integer number (3376737).

Almost surely, 2^381218400 is an apocalyptic number.

381218400 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 381218400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (729375192).

381218400 is an abundant number, since it is smaller than the sum of its proper divisors (1077531984).

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

381218400 is a wasteful number, since it uses less digits than its factorization.

381218400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125 (or 100 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 27.

The square root of 381218400 is about 19524.8149799172. The cubic root of 381218400 is about 725.0889466773.

The spelling of 381218400 in words is "three hundred eighty-one million, two hundred eighteen thousand, four hundred".