381066 has 32 divisors (see below), whose sum is σ = 895488. Its totient is φ = 105840.

The previous prime is 381061. The next prime is 381071. The reversal of 381066 is 660183.

It is an interprime number because it is at equal distance from previous prime (381061) and next prime (381071).

It is a super-2 number, since 2×381066² = 290422592712, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (381061) by changing a digit.

381066 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1701 + ... + 1911.

It is an arithmetic number, because the mean of its divisors is an integer number (27984).

2³⁸¹⁰⁶⁶ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 381066, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (447744).

381066 is an abundant number, since it is smaller than the sum of its proper divisors (514422).

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

381066 is a wasteful number, since it uses less digits than its factorization.

381066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 266.

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 381066 is about 617.3054349348. The cubic root of 381066 is about 72.4992310660.

The spelling of 381066 in words is "three hundred eighty-one thousand, sixty-six".