381766 has 32 divisors (see below), whose sum is σ = 744192. Its totient is φ = 142560.

The previous prime is 381761. The next prime is 381791. The reversal of 381766 is 667183.

381766 = T₂₁ + T₂₂ + ... + T₁₃₁.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (381761) by changing a digit.

381766 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, 5665 + ... + 5731.

It is an arithmetic number, because the mean of its divisors is an integer number (23256).

2³⁸¹⁷⁶⁶ is an apocalyptic number.

381766 is a deficient number, since it is larger than the sum of its proper divisors (362426).

381766 is a wasteful number, since it uses less digits than its factorization.

381766 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124.

The product of its digits is 6048, while the sum is 31.

The square root of 381766 is about 617.8721550612. The cubic root of 381766 is about 72.5435964503.

It can be divided in two parts, 3817 and 66, that added together give a palindrome (3883).

The spelling of 381766 in words is "three hundred eighty-one thousand, seven hundred sixty-six".