40208680397 has 2 divisors, whose sum is σ = 40208680398. Its totient is φ = 40208680396.

The previous prime is 40208680373. The next prime is 40208680427. The reversal of 40208680397 is 79308680204.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28583312356 + 11625368041 = 169066^2 + 107821^2 .

It is a cyclic number.

It is not a de Polignac number, because 40208680397 - 2⁶ = 40208680333 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40208680307) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20104340198 + 20104340199.

It is an arithmetic number, because the mean of its divisors is an integer number (20104340199).

Almost surely, 2^40208680397 is an apocalyptic number.

It is an amenable number.

40208680397 is a deficient number, since it is larger than the sum of its proper divisors (1).

40208680397 is an equidigital number, since it uses as much as digits as its factorization.

40208680397 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 580608, while the sum is 47.

The spelling of 40208680397 in words is "forty billion, two hundred eight million, six hundred eighty thousand, three hundred ninety-seven".