40028213 has 2 divisors, whose sum is σ = 40028214. Its totient is φ = 40028212.

The previous prime is 40028201. The next prime is 40028291. The reversal of 40028213 is 31282004.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 37662769 + 2365444 = 6137^2 + 1538^2 .

It is a cyclic number.

It is not a de Polignac number, because 40028213 - 2¹⁰ = 40027189 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 (40028113) 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, 20014106 + 20014107.

It is an arithmetic number, because the mean of its divisors is an integer number (20014107).

Almost surely, 2^40028213 is an apocalyptic number.

It is an amenable number.

40028213 is a deficient number, since it is larger than the sum of its proper divisors (1).

40028213 is an equidigital number, since it uses as much as digits as its factorization.

40028213 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 40028213 is about 6326.7853606709. The cubic root of 40028213 is about 342.0755763576.

The spelling of 40028213 in words is "forty million, twenty-eight thousand, two hundred thirteen".