38911999729 has 2 divisors, whose sum is σ = 38911999730. Its totient is φ = 38911999728.

The previous prime is 38911999723. The next prime is 38911999741. The reversal of 38911999729 is 92799911983.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 23099440225 + 15812559504 = 151985^2 + 125748^2 .

It is a cyclic number.

It is not a de Polignac number, because 38911999729 - 2¹⁹ = 38911475441 is a prime.

It is not a weakly prime, because it can be changed into another prime (38911999723) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19455999864 + 19455999865.

It is an arithmetic number, because the mean of its divisors is an integer number (19455999865).

Almost surely, 2^38911999729 is an apocalyptic number.

It is an amenable number.

38911999729 is a deficient number, since it is larger than the sum of its proper divisors (1).

38911999729 is an equidigital number, since it uses as much as digits as its factorization.

38911999729 is an evil number, because the sum of its binary digits is even.

The product of its digits is 19840464, while the sum is 67.

The spelling of 38911999729 in words is "thirty-eight billion, nine hundred eleven million, nine hundred ninety-nine thousand, seven hundred twenty-nine".