381718 has 16 divisors (see below), whose sum is σ = 617760. Its totient is φ = 176256.

The previous prime is 381713. The next prime is 381737. The reversal of 381718 is 817183.

It is a happy number.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (381713) by changing a digit.

381718 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 7 ways as a sum of consecutive naturals, for example, 3448 + ... + 3556.

It is an arithmetic number, because the mean of its divisors is an integer number (38610).

2³⁸¹⁷¹⁸ is an apocalyptic number.

381718 is a deficient number, since it is larger than the sum of its proper divisors (236042).

381718 is a wasteful number, since it uses less digits than its factorization.

381718 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 231.

The product of its digits is 1344, while the sum is 28.

The square root of 381718 is about 617.8333108533. The cubic root of 381718 is about 72.5405559852.

The spelling of 381718 in words is "three hundred eighty-one thousand, seven hundred eighteen".