40518223 has 2 divisors, whose sum is σ = 40518224. Its totient is φ = 40518222.

The previous prime is 40518211. The next prime is 40518239. The reversal of 40518223 is 32281504.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40518223 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40518253) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20259111 + 20259112.

It is an arithmetic number, because the mean of its divisors is an integer number (20259112).

Almost surely, 2^40518223 is an apocalyptic number.

40518223 is a deficient number, since it is larger than the sum of its proper divisors (1).

40518223 is an equidigital number, since it uses as much as digits as its factorization.

40518223 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1920, while the sum is 25.

The square root of 40518223 is about 6365.3926037598. The cubic root of 40518223 is about 343.4657715308.

Adding to 40518223 its reverse (32281504), we get a palindrome (72799727).

The spelling of 40518223 in words is "forty million, five hundred eighteen thousand, two hundred twenty-three".