40939817 has 2 divisors, whose sum is σ = 40939818. Its totient is φ = 40939816.

The previous prime is 40939799. The next prime is 40939837. The reversal of 40939817 is 71893904.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 32535616 + 8404201 = 5704^2 + 2899^2 .

It is a cyclic number.

It is not a de Polignac number, because 40939817 - 2¹² = 40935721 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (40939837) 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, 20469908 + 20469909.

It is an arithmetic number, because the mean of its divisors is an integer number (20469909).

Almost surely, 2^40939817 is an apocalyptic number.

It is an amenable number.

40939817 is a deficient number, since it is larger than the sum of its proper divisors (1).

40939817 is an equidigital number, since it uses as much as digits as its factorization.

40939817 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 54432, while the sum is 41.

The square root of 40939817 is about 6398.4230088358. The cubic root of 40939817 is about 344.6529226716.

The spelling of 40939817 in words is "forty million, nine hundred thirty-nine thousand, eight hundred seventeen".