385283781 has 12 divisors (see below), whose sum is σ = 561723552. Its totient is φ = 254454696.

The previous prime is 385283771. The next prime is 385283797. The reversal of 385283781 is 187382583.

It is not a de Polignac number, because 385283781 - 2⁵ = 385283749 is a prime.

It is a super-2 number, since 2×385283781² = 296887183803311922, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (385283771) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 199081 + ... + 201006.

It is an arithmetic number, because the mean of its divisors is an integer number (46810296).

Almost surely, 2^385283781 is an apocalyptic number.

It is an amenable number.

385283781 is a deficient number, since it is larger than the sum of its proper divisors (176439771).

385283781 is a wasteful number, since it uses less digits than its factorization.

385283781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 400200 (or 400197 counting only the distinct ones).

The product of its digits is 322560, while the sum is 45.

The square root of 385283781 is about 19628.6469477649. The cubic root of 385283781 is about 727.6573309071.

The spelling of 385283781 in words is "three hundred eighty-five million, two hundred eighty-three thousand, seven hundred eighty-one".