40865831 has 4 divisors (see below), whose sum is σ = 41383200. Its totient is φ = 40348464.

The previous prime is 40865821. The next prime is 40865837. The reversal of 40865831 is 13856804.

40865831 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 40865831 - 2⁶ = 40865767 is a prime.

It is a super-2 number, since 2×40865831² = 3340032286641122, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 40865791 and 40865800.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40865837) 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 3 ways as a sum of consecutive naturals, for example, 258566 + ... + 258723.

It is an arithmetic number, because the mean of its divisors is an integer number (10345800).

Almost surely, 2^40865831 is an apocalyptic number.

40865831 is a deficient number, since it is larger than the sum of its proper divisors (517369).

40865831 is an equidigital number, since it uses as much as digits as its factorization.

40865831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 517368.

The product of its (nonzero) digits is 23040, while the sum is 35.

The square root of 40865831 is about 6392.6388135104. The cubic root of 40865831 is about 344.4451797841.

The spelling of 40865831 in words is "forty million, eight hundred sixty-five thousand, eight hundred thirty-one".