40340402309 has 2 divisors, whose sum is σ = 40340402310. Its totient is φ = 40340402308.

The previous prime is 40340402299. The next prime is 40340402329. The reversal of 40340402309 is 90320404304.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 40314616225 + 25786084 = 200785^2 + 5078^2 .

It is a cyclic number.

It is not a de Polignac number, because 40340402309 - 2¹² = 40340398213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40340402329) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20170201154 + 20170201155.

It is an arithmetic number, because the mean of its divisors is an integer number (20170201155).

Almost surely, 2^40340402309 is an apocalyptic number.

It is an amenable number.

40340402309 is a deficient number, since it is larger than the sum of its proper divisors (1).

40340402309 is an equidigital number, since it uses as much as digits as its factorization.

40340402309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10368, while the sum is 29.

The spelling of 40340402309 in words is "forty billion, three hundred forty million, four hundred two thousand, three hundred nine".