39868281 has 28 divisors (see below), whose sum is σ = 63310932. Its totient is φ = 25007616.

The previous prime is 39868273. The next prime is 39868291. The reversal of 39868281 is 18286893.

39868281 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 33698025 + 6170256 = 5805^2 + 2484^2 .

It is not a de Polignac number, because 39868281 - 2³ = 39868273 is a prime.

It is a super-2 number, since 2×39868281² = 3178959659789922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (39868211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 10785 + ... + 14001.

Almost surely, 2^39868281 is an apocalyptic number.

It is an amenable number.

39868281 is a deficient number, since it is larger than the sum of its proper divisors (23442651).

39868281 is an equidigital number, since it uses as much as digits as its factorization.

39868281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3252 (or 3237 counting only the distinct ones).

The product of its digits is 165888, while the sum is 45.

The square root of 39868281 is about 6314.1334322296. The cubic root of 39868281 is about 341.6193826561.

The spelling of 39868281 in words is "thirty-nine million, eight hundred sixty-eight thousand, two hundred eighty-one".