40856243 has 2 divisors, whose sum is σ = 40856244. Its totient is φ = 40856242.

The previous prime is 40856239. The next prime is 40856297. The reversal of 40856243 is 34265804.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 40856243 - 2² = 40856239 is a prime.

It is a Sophie Germain prime.

It is equal to p_2482628 and since 40856243 and 2482628 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (40856743) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20428121 + 20428122.

It is an arithmetic number, because the mean of its divisors is an integer number (20428122).

Almost surely, 2^40856243 is an apocalyptic number.

40856243 is a deficient number, since it is larger than the sum of its proper divisors (1).

40856243 is an equidigital number, since it uses as much as digits as its factorization.

40856243 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23040, while the sum is 32.

The square root of 40856243 is about 6391.8888444653. Note that the first 4 decimals coincide. The cubic root of 40856243 is about 344.4182396028.

The spelling of 40856243 in words is "forty million, eight hundred fifty-six thousand, two hundred forty-three".