40538405009 has 2 divisors, whose sum is σ = 40538405010. Its totient is φ = 40538405008.

The previous prime is 40538404999. The next prime is 40538405029. The reversal of 40538405009 is 90050483504.

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., 37057405009 + 3481000000 = 192503^2 + 59000^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40538405009 is a prime.

It is not a weakly prime, because it can be changed into another prime (40538405029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20269202504 + 20269202505.

It is an arithmetic number, because the mean of its divisors is an integer number (20269202505).

Almost surely, 2^40538405009 is an apocalyptic number.

It is an amenable number.

40538405009 is a deficient number, since it is larger than the sum of its proper divisors (1).

40538405009 is an equidigital number, since it uses as much as digits as its factorization.

40538405009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 86400, while the sum is 38.

The spelling of 40538405009 in words is "forty billion, five hundred thirty-eight million, four hundred five thousand, nine".