40856831 has 4 divisors (see below), whose sum is σ = 43260192. Its totient is φ = 38453472.

The previous prime is 40856813. The next prime is 40856839. The reversal of 40856831 is 13865804.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40856831 is a prime.

It is a super-2 number, since 2×40856831² = 3338561278725122, 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 = 40856791 and 40856800.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40856839) 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 3 ways as a sum of consecutive naturals, for example, 1201655 + ... + 1201688.

It is an arithmetic number, because the mean of its divisors is an integer number (10815048).

Almost surely, 2^40856831 is an apocalyptic number.

40856831 is a deficient number, since it is larger than the sum of its proper divisors (2403361).

40856831 is a wasteful number, since it uses less digits than its factorization.

40856831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2403360.

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

The square root of 40856831 is about 6391.9348400934. The cubic root of 40856831 is about 344.4198918754.

The spelling of 40856831 in words is "forty million, eight hundred fifty-six thousand, eight hundred thirty-one".