40043863 has 2 divisors, whose sum is σ = 40043864. Its totient is φ = 40043862.

The previous prime is 40043827. The next prime is 40043869. The reversal of 40043863 is 36834004.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40043863 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40043869) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20021931 + 20021932.

It is an arithmetic number, because the mean of its divisors is an integer number (20021932).

Almost surely, 2^40043863 is an apocalyptic number.

40043863 is a deficient number, since it is larger than the sum of its proper divisors (1).

40043863 is an equidigital number, since it uses as much as digits as its factorization.

40043863 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6912, while the sum is 28.

The square root of 40043863 is about 6328.0220448415. The cubic root of 40043863 is about 342.1201514613.

Adding to 40043863 its reverse (36834004), we get a palindrome (76877867).

The spelling of 40043863 in words is "forty million, forty-three thousand, eight hundred sixty-three".