40821617 has 2 divisors, whose sum is σ = 40821618. Its totient is φ = 40821616.

The previous prime is 40821611. The next prime is 40821629. The reversal of 40821617 is 71612804.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 24167056 + 16654561 = 4916^2 + 4081^2 .

It is a cyclic number.

It is not a de Polignac number, because 40821617 - 2⁶ = 40821553 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 40821617.

It is not a weakly prime, because it can be changed into another prime (40821611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20410808 + 20410809.

It is an arithmetic number, because the mean of its divisors is an integer number (20410809).

Almost surely, 2^40821617 is an apocalyptic number.

It is an amenable number.

40821617 is a deficient number, since it is larger than the sum of its proper divisors (1).

40821617 is an equidigital number, since it uses as much as digits as its factorization.

40821617 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2688, while the sum is 29.

The square root of 40821617 is about 6389.1796813049. The cubic root of 40821617 is about 344.3209130112.

The spelling of 40821617 in words is "forty million, eight hundred twenty-one thousand, six hundred seventeen".