385781 has 8 divisors (see below), whose sum is σ = 445824. Its totient is φ = 329920.

The previous prime is 385771. The next prime is 385783. The reversal of 385781 is 187583.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 385781 - 2¹⁰ = 384757 is a prime.

It is a super-2 number, since 2×385781² = 297653959922, which contains 22 as substring.

It is a Duffinian number.

It is a nialpdrome in base 5.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (385783) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 845 + ... + 1218.

It is an arithmetic number, because the mean of its divisors is an integer number (55728).

2³⁸⁵⁷⁸¹ is an apocalyptic number.

It is an amenable number.

385781 is a deficient number, since it is larger than the sum of its proper divisors (60043).

385781 is a wasteful number, since it uses less digits than its factorization.

385781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2091.

The product of its digits is 6720, while the sum is 32.

The square root of 385781 is about 621.1127111886. The cubic root of 385781 is about 72.7970216750.

The spelling of 385781 in words is "three hundred eighty-five thousand, seven hundred eighty-one".