865833381 has 30 divisors (see below), whose sum is σ = 1504580550. Its totient is φ = 494759664.

The previous prime is 865833361. The next prime is 865833383. The reversal of 865833381 is 183338568.

It can be written as a sum of positive squares in only one way, i.e., 603684900 + 262148481 = 24570^2 + 16191^2 .

It is not a de Polignac number, because 865833381 - 2¹⁵ = 865800613 is a prime.

It is a super-2 number, since 2×865833381² = 1499334887307782322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (865833383) by changing a digit.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 105106 + ... + 113043.

It is an arithmetic number, because the mean of its divisors is an integer number (50152685).

Almost surely, 2^865833381 is an apocalyptic number.

865833381 is a gapful number since it is divisible by the number (81) formed by its first and last digit.

It is an amenable number.

865833381 is a deficient number, since it is larger than the sum of its proper divisors (638747169).

865833381 is a wasteful number, since it uses less digits than its factorization.

865833381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 218175 (or 218159 counting only the distinct ones).

The product of its digits is 414720, while the sum is 45.

The square root of 865833381 is about 29425.0468308888. The cubic root of 865833381 is about 953.1138383156.

The spelling of 865833381 in words is "eight hundred sixty-five million, eight hundred thirty-three thousand, three hundred eighty-one".