40520213 has 2 divisors, whose sum is σ = 40520214. Its totient is φ = 40520212.

The previous prime is 40520167. The next prime is 40520219. The reversal of 40520213 is 31202504.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 39225169 + 1295044 = 6263^2 + 1138^2 .

It is a cyclic number.

It is not a de Polignac number, because 40520213 - 2⁶ = 40520149 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 40520191 and 40520200.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40520219) 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, 20260106 + 20260107.

It is an arithmetic number, because the mean of its divisors is an integer number (20260107).

Almost surely, 2^40520213 is an apocalyptic number.

It is an amenable number.

40520213 is a deficient number, since it is larger than the sum of its proper divisors (1).

40520213 is an equidigital number, since it uses as much as digits as its factorization.

40520213 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 240, while the sum is 17.

The square root of 40520213 is about 6365.5489158438. The cubic root of 40520213 is about 343.4713943975.

Adding to 40520213 its reverse (31202504), we get a palindrome (71722717).

The spelling of 40520213 in words is "forty million, five hundred twenty thousand, two hundred thirteen".