381100 has 36 divisors (see below), whose sum is σ = 857584. Its totient is φ = 146880.

The previous prime is 381097. The next prime is 381103. The reversal of 381100 is 1183.

381100 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (381097) and next prime (381103).

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (381103) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3649 + ... + 3751.

2³⁸¹¹⁰⁰ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 381100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (428792).

381100 is an abundant number, since it is smaller than the sum of its proper divisors (476484).

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

381100 is a wasteful number, since it uses less digits than its factorization.

381100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 154 (or 147 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 381100 is about 617.3329733620. The cubic root of 381100 is about 72.5013872109.

Adding to 381100 its reverse (1183), we get a palindrome (382283).

The spelling of 381100 in words is "three hundred eighty-one thousand, one hundred".