40856781 has 8 divisors (see below), whose sum is σ = 62257984. Its totient is φ = 23346720.

The previous prime is 40856779. The next prime is 40856813. The reversal of 40856781 is 18765804.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 40856781 - 2¹ = 40856779 is a prime.

It is a super-2 number, since 2×40856781² = 3338553107363922, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40856731) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 972760 + ... + 972801.

It is an arithmetic number, because the mean of its divisors is an integer number (7782248).

Almost surely, 2^40856781 is an apocalyptic number.

It is an amenable number.

40856781 is a deficient number, since it is larger than the sum of its proper divisors (21401203).

40856781 is a wasteful number, since it uses less digits than its factorization.

40856781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1945571.

The product of its (nonzero) digits is 53760, while the sum is 39.

The square root of 40856781 is about 6391.9309289134. The cubic root of 40856781 is about 344.4197513766.

The spelling of 40856781 in words is "forty million, eight hundred fifty-six thousand, seven hundred eighty-one".