40664213 has 2 divisors, whose sum is σ = 40664214. Its totient is φ = 40664212.

The previous prime is 40664209. The next prime is 40664227. The reversal of 40664213 is 31246604.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 31561924 + 9102289 = 5618^2 + 3017^2 .

It is a cyclic number.

It is not a de Polignac number, because 40664213 - 2² = 40664209 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40664233) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20332106 + 20332107.

It is an arithmetic number, because the mean of its divisors is an integer number (20332107).

Almost surely, 2^40664213 is an apocalyptic number.

It is an amenable number.

40664213 is a deficient number, since it is larger than the sum of its proper divisors (1).

40664213 is an equidigital number, since it uses as much as digits as its factorization.

40664213 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3456, while the sum is 26.

The square root of 40664213 is about 6376.8497708508. The cubic root of 40664213 is about 343.8777875090.

The spelling of 40664213 in words is "forty million, six hundred sixty-four thousand, two hundred thirteen".