381778 has 4 divisors (see below), whose sum is σ = 572670. Its totient is φ = 190888.

The previous prime is 381761. The next prime is 381791. The reversal of 381778 is 877183.

It is a happy number.

381778 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 877183 = 17 ⋅51599.

It can be written as a sum of positive squares in only one way, i.e., 380689 + 1089 = 617^2 + 33^2 .

It is an unprimeable number.

381778 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 as a sum of consecutive naturals, namely, 95443 + ... + 95446.

2³⁸¹⁷⁷⁸ is an apocalyptic number.

381778 is a deficient number, since it is larger than the sum of its proper divisors (190892).

381778 is a wasteful number, since it uses less digits than its factorization.

381778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 190891.

The product of its digits is 9408, while the sum is 34.

The square root of 381778 is about 617.8818657316. The cubic root of 381778 is about 72.5443565267.

The spelling of 381778 in words is "three hundred eighty-one thousand, seven hundred seventy-eight".