40905217 has 2 divisors, whose sum is σ = 40905218. Its totient is φ = 40905216.

The previous prime is 40905211. The next prime is 40905223. The reversal of 40905217 is 71250904.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (40905211) and next prime (40905223).

It can be written as a sum of positive squares in only one way, i.e., 40564161 + 341056 = 6369^2 + 584^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40905217 is a prime.

It is not a weakly prime, because it can be changed into another prime (40905211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20452608 + 20452609.

It is an arithmetic number, because the mean of its divisors is an integer number (20452609).

Almost surely, 2^40905217 is an apocalyptic number.

It is an amenable number.

40905217 is a deficient number, since it is larger than the sum of its proper divisors (1).

40905217 is an equidigital number, since it uses as much as digits as its factorization.

40905217 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2520, while the sum is 28.

The square root of 40905217 is about 6395.7186460944. The cubic root of 40905217 is about 344.5558016370. Note that the first 3 decimals are identical.

The spelling of 40905217 in words is "forty million, nine hundred five thousand, two hundred seventeen".