40688117 has 2 divisors, whose sum is σ = 40688118. Its totient is φ = 40688116.

The previous prime is 40688099. The next prime is 40688119. The reversal of 40688117 is 71188604.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 30184036 + 10504081 = 5494^2 + 3241^2 .

It is a cyclic number.

It is not a de Polignac number, because 40688117 - 2¹⁴ = 40671733 is a prime.

Together with 40688119, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40688119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20344058 + 20344059.

It is an arithmetic number, because the mean of its divisors is an integer number (20344059).

Almost surely, 2^40688117 is an apocalyptic number.

It is an amenable number.

40688117 is a deficient number, since it is larger than the sum of its proper divisors (1).

40688117 is an equidigital number, since it uses as much as digits as its factorization.

40688117 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10752, while the sum is 35.

The square root of 40688117 is about 6378.7237751763. The cubic root of 40688117 is about 343.9451558726.

The spelling of 40688117 in words is "forty million, six hundred eighty-eight thousand, one hundred seventeen".