381612 has 72 divisors (see below), whose sum is σ = 1149120. Its totient is φ = 97440.

The previous prime is 381607. The next prime is 381629. The reversal of 381612 is 216183.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is an alternating number because its digits alternate between odd and even.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 381612.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6439 + ... + 6497.

It is an arithmetic number, because the mean of its divisors is an integer number (15960).

2³⁸¹⁶¹² 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 381612, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (574560).

381612 is an abundant number, since it is smaller than the sum of its proper divisors (767508).

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

381612 is a wasteful number, since it uses less digits than its factorization.

381612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91 (or 82 counting only the distinct ones).

The product of its digits is 288, while the sum is 21.

The square root of 381612 is about 617.7475212415. The cubic root of 381612 is about 72.5338407218.

Adding to 381612 its reverse (216183), we get a palindrome (597795).

It can be divided in two parts, 3816 and 12, that added together give a triangular number (3828 = T₈₇).

The spelling of 381612 in words is "three hundred eighty-one thousand, six hundred twelve".