381403800 has 72 divisors (see below), whose sum is σ = 1280887140. Its totient is φ = 101707200.

The previous prime is 381403783. The next prime is 381403801. The reversal of 381403800 is 8304183.

It is a tau number, because it is divible by the number of its divisors (72).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (381403801) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 104146 + ... + 107745.

Almost surely, 2^381403800 is an apocalyptic number.

381403800 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

381403800 is an abundant number, since it is smaller than the sum of its proper divisors (899483340).

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

381403800 is a wasteful number, since it uses less digits than its factorization.

381403800 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 211913 (or 211901 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

The square root of 381403800 is about 19529.5622070747. The cubic root of 381403800 is about 725.2064730993.

Adding to 381403800 its reverse (8304183), we get a palindrome (389707983).

The spelling of 381403800 in words is "three hundred eighty-one million, four hundred three thousand, eight hundred".