40018213 has 2 divisors, whose sum is σ = 40018214. Its totient is φ = 40018212.

The previous prime is 40018211. The next prime is 40018217. The reversal of 40018213 is 31281004.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 36457444 + 3560769 = 6038^2 + 1887^2 .

It is a cyclic number.

It is not a de Polignac number, because 40018213 - 2¹ = 40018211 is a prime.

Together with 40018211, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40018211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20009106 + 20009107.

It is an arithmetic number, because the mean of its divisors is an integer number (20009107).

Almost surely, 2^40018213 is an apocalyptic number.

It is an amenable number.

40018213 is a deficient number, since it is larger than the sum of its proper divisors (1).

40018213 is an equidigital number, since it uses as much as digits as its factorization.

40018213 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 192, while the sum is 19.

The square root of 40018213 is about 6325.9950205482. The cubic root of 40018213 is about 342.0470877791.

Adding to 40018213 its reverse (31281004), we get a palindrome (71299217).

The spelling of 40018213 in words is "forty million, eighteen thousand, two hundred thirteen".