385881 has 8 divisors (see below), whose sum is σ = 517440. Its totient is φ = 255792.

The previous prime is 385877. The next prime is 385897. The reversal of 385881 is 188583.

385881 = T₁₉₈ + T₁₉₉ + ... + T₂₁₅.

385881 is a nontrivial binomial coefficient, being equal to C(879, 2).

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

It is not a de Polignac number, because 385881 - 2² = 385877 is a prime.

It is a super-2 number, since 2×385881² = 297808292322, which contains 22 as substring.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (385811) 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 7 ways as a sum of consecutive naturals, for example, 660 + ... + 1098.

It is an arithmetic number, because the mean of its divisors is an integer number (64680).

2³⁸⁵⁸⁸¹ is an apocalyptic number.

385881 is the 878-th triangular number.

It is an amenable number.

385881 is a deficient number, since it is larger than the sum of its proper divisors (131559).

385881 is a wasteful number, since it uses less digits than its factorization.

385881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 735.

The product of its digits is 7680, while the sum is 33.

The square root of 385881 is about 621.1932066596. The cubic root of 385881 is about 72.8033111443.

The spelling of 385881 in words is "three hundred eighty-five thousand, eight hundred eighty-one".