40643233 has 2 divisors, whose sum is σ = 40643234. Its totient is φ = 40643232.

The previous prime is 40643219. The next prime is 40643257. The reversal of 40643233 is 33234604.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 40551424 + 91809 = 6368^2 + 303^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40643233 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 40643198 and 40643207.

It is not a weakly prime, because it can be changed into another prime (40613233) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20321616 + 20321617.

It is an arithmetic number, because the mean of its divisors is an integer number (20321617).

Almost surely, 2^40643233 is an apocalyptic number.

It is an amenable number.

40643233 is a deficient number, since it is larger than the sum of its proper divisors (1).

40643233 is an equidigital number, since it uses as much as digits as its factorization.

40643233 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5184, while the sum is 25.

The square root of 40643233 is about 6375.2045457381. The cubic root of 40643233 is about 343.8186380624.

Adding to 40643233 its reverse (33234604), we get a palindrome (73877837).

The spelling of 40643233 in words is "forty million, six hundred forty-three thousand, two hundred thirty-three".