40688761 has 2 divisors, whose sum is σ = 40688762. Its totient is φ = 40688760.

The previous prime is 40688749. The next prime is 40688777. The reversal of 40688761 is 16788604.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 33698025 + 6990736 = 5805^2 + 2644^2 .

It is a cyclic number.

It is not a de Polignac number, because 40688761 - 2¹¹ = 40686713 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (40688741) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20344380 + 20344381.

It is an arithmetic number, because the mean of its divisors is an integer number (20344381).

Almost surely, 2^40688761 is an apocalyptic number.

It is an amenable number.

40688761 is a deficient number, since it is larger than the sum of its proper divisors (1).

40688761 is an equidigital number, since it uses as much as digits as its factorization.

40688761 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64512, while the sum is 40.

The square root of 40688761 is about 6378.7742552939. The cubic root of 40688761 is about 343.9469704853.

The spelling of 40688761 in words is "forty million, six hundred eighty-eight thousand, seven hundred sixty-one".