381779 has 4 divisors (see below), whose sum is σ = 383376. Its totient is φ = 380184.

The previous prime is 381761. The next prime is 381791. The reversal of 381779 is 977183.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 381779 - 2⁸ = 381523 is a prime.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 381779.

It is not an unprimeable number, because it can be changed into a prime (381739) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 359 + ... + 944.

It is an arithmetic number, because the mean of its divisors is an integer number (95844).

2³⁸¹⁷⁷⁹ is an apocalyptic number.

381779 is a deficient number, since it is larger than the sum of its proper divisors (1597).

381779 is a wasteful number, since it uses less digits than its factorization.

381779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1596.

The product of its digits is 10584, while the sum is 35.

The square root of 381779 is about 617.8826749473. The cubic root of 381779 is about 72.5444198657.

The spelling of 381779 in words is "three hundred eighty-one thousand, seven hundred seventy-nine".