40436213 has 2 divisors, whose sum is σ = 40436214. Its totient is φ = 40436212.

The previous prime is 40436173. The next prime is 40436219. The reversal of 40436213 is 31263404.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 34374769 + 6061444 = 5863^2 + 2462^2 .

It is a cyclic number.

It is not a de Polignac number, because 40436213 - 2⁸ = 40435957 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40436219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20218106 + 20218107.

It is an arithmetic number, because the mean of its divisors is an integer number (20218107).

Almost surely, 2^40436213 is an apocalyptic number.

It is an amenable number.

40436213 is a deficient number, since it is larger than the sum of its proper divisors (1).

40436213 is an equidigital number, since it uses as much as digits as its factorization.

40436213 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1728, while the sum is 23.

The square root of 40436213 is about 6358.9474758013. The cubic root of 40436213 is about 343.2338869510.

Adding to 40436213 its reverse (31263404), we get a palindrome (71699617).

The spelling of 40436213 in words is "forty million, four hundred thirty-six thousand, two hundred thirteen".