40819213 has 2 divisors, whose sum is σ = 40819214. Its totient is φ = 40819212.

The previous prime is 40819199. The next prime is 40819217. The reversal of 40819213 is 31291804.

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., 38975049 + 1844164 = 6243^2 + 1358^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40819213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40819217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20409606 + 20409607.

It is an arithmetic number, because the mean of its divisors is an integer number (20409607).

Almost surely, 2^40819213 is an apocalyptic number.

It is an amenable number.

40819213 is a deficient number, since it is larger than the sum of its proper divisors (1).

40819213 is an equidigital number, since it uses as much as digits as its factorization.

40819213 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 28.

The square root of 40819213 is about 6388.9915479675. The cubic root of 40819213 is about 344.3141538168.

The spelling of 40819213 in words is "forty million, eight hundred nineteen thousand, two hundred thirteen".